Update module github.com/googleapis/gax-go/v2 to v2.15.0 (open-telemetry#41314)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[github.com/googleapis/gax-go/v2](https://redirect.github.com/googleapis/gax-go)
| `v2.14.2` -> `v2.15.0` |
[![age](https://developer.mend.io/api/mc/badges/age/go/github.com%2fgoogleapis%2fgax-go%2fv2/v2.15.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/go/github.com%2fgoogleapis%2fgax-go%2fv2/v2.14.2/v2.15.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>googleapis/gax-go (github.com/googleapis/gax-go/v2)</summary>

###
[`v2.15.0`](https://redirect.github.com/googleapis/gax-go/releases/tag/v2.15.0)

[Compare
Source](https://redirect.github.com/googleapis/gax-go/compare/v2.14.2...v2.15.0)

##### Features

- **apierror:** improve gRPC status code mapping for HTTP errors
([#&open-telemetry#8203;431](https://redirect.github.com/googleapis/gax-go/issues/431))
([c207f2a](https://redirect.github.com/googleapis/gax-go/commit/c207f2a19ab91d3baee458b57d4aa992519025c7))

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "on tuesday" (UTC), Automerge - At any
time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/open-telemetry/opentelemetry-collector-contrib).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4yMy4yIiwidXBkYXRlZEluVmVyIjoiNDEuMjMuMiIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiZGVwZW5kZW5jaWVzIiwicmVub3ZhdGVib3QiXX0=-->

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>
Co-authored-by: Yang Song <songy23@users.noreply.github.com>

Author: 3 people

confmap/provider/googlesecretmanagerprovider/go.mod

@@ -4,7 +4,7 @@ go 1.23.0
 
 require (
 	cloud.google.com/go/secretmanager v1.15.0
-	github.com/googleapis/gax-go/v2 v2.14.2
+	github.com/googleapis/gax-go/v2 v2.15.0
 	github.com/stretchr/testify v1.10.0
 	go.opentelemetry.io/collector/confmap v1.36.0
 	go.uber.org/goleak v1.3.0
@@ -48,8 +48,8 @@ require (
 	golang.org/x/sys v0.33.0 // indirect
 	golang.org/x/text v0.26.0 // indirect
 	golang.org/x/time v0.12.0 // indirect
-	google.golang.org/api v0.237.0 // indirect
-	google.golang.org/genproto v0.0.0-20250505200425-f936aa4a68b2 // indirect
+	google.golang.org/api v0.239.0 // indirect
+	google.golang.org/genproto v0.0.0-20250603155806-513f23925822 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20250603155806-513f23925822 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250603155806-513f23925822 // indirect
 	google.golang.org/protobuf v1.36.6 // indirect

confmap/provider/googlesecretmanagerprovider/go.sum

@@ -5,7 +5,7 @@ go 1.23.0
 require (
 	cloud.google.com/go/pubsub v1.49.0
 	github.com/google/uuid v1.6.0
-	github.com/googleapis/gax-go/v2 v2.14.2
+	github.com/googleapis/gax-go/v2 v2.15.0
 	github.com/stretchr/testify v1.10.0
 	go.opentelemetry.io/collector/component v1.36.0
 	go.opentelemetry.io/collector/component/componenttest v0.130.0
@@ -81,8 +81,8 @@ require (
 	golang.org/x/sys v0.33.0 // indirect
 	golang.org/x/text v0.26.0 // indirect
 	golang.org/x/time v0.12.0 // indirect
-	google.golang.org/genproto v0.0.0-20250505200425-f936aa4a68b2 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20250505200425-f936aa4a68b2 // indirect
+	google.golang.org/genproto v0.0.0-20250603155806-513f23925822 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20250603155806-513f23925822 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250603155806-513f23925822 // indirect
 	google.golang.org/protobuf v1.36.6 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

exporter/googlecloudpubsubexporter/go.mod

@@ -6,7 +6,7 @@ require (
 	cloud.google.com/go/logging v1.13.0
 	cloud.google.com/go/pubsub v1.49.0
 	github.com/google/go-cmp v0.7.0
-	github.com/googleapis/gax-go/v2 v2.14.2
+	github.com/googleapis/gax-go/v2 v2.15.0
 	github.com/iancoleman/strcase v0.3.0
 	github.com/json-iterator/go v1.1.12
 	github.com/open-telemetry/opentelemetry-collector-contrib/extension/encoding v0.130.0
@@ -30,8 +30,8 @@ require (
 	go.uber.org/multierr v1.11.0
 	go.uber.org/zap v1.27.0
 	google.golang.org/api v0.241.0
-	google.golang.org/genproto v0.0.0-20250505200425-f936aa4a68b2
-	google.golang.org/genproto/googleapis/api v0.0.0-20250505200425-f936aa4a68b2
+	google.golang.org/genproto v0.0.0-20250603155806-513f23925822
+	google.golang.org/genproto/googleapis/api v0.0.0-20250603155806-513f23925822
 	google.golang.org/grpc v1.73.0
 	google.golang.org/protobuf v1.36.6
 )