Bump go.opentelemetry.io/collector/model in /testbed

Bumps [go.opentelemetry.io/collector/model](https://github.com/open-telemetry/opentelemetry-collector) from 0.47.0 to 0.50.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-collector/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-collector/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-collector@v0.47.0...v0.50.0)

---
updated-dependencies:
- dependency-name: go.opentelemetry.io/collector/model
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

testbed/go.mod

@@ -25,9 +25,9 @@ require (
 	github.com/prometheus/common v0.32.1
 	github.com/prometheus/prometheus v1.8.2-0.20220117154355-4855a0c067e2
 	github.com/shirou/gopsutil/v3 v3.22.2
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.7.1
 	go.opentelemetry.io/collector v0.47.0
-	go.opentelemetry.io/collector/model v0.47.0
+	go.opentelemetry.io/collector/model v0.50.0
 	go.uber.org/atomic v1.9.0
 	go.uber.org/zap v1.21.0
 	golang.org/x/text v0.3.7
@@ -62,7 +62,7 @@ require (
 	github.com/docker/distribution v2.7.1+incompatible // indirect
 	github.com/docker/docker v20.10.13+incompatible // indirect
 	github.com/docker/go-units v0.4.0 // indirect
-	github.com/envoyproxy/go-control-plane v0.10.1 // indirect
+	github.com/envoyproxy/go-control-plane v0.10.2-0.20220325020618-49ff273808a1 // indirect
 	github.com/envoyproxy/protoc-gen-validate v0.6.2 // indirect
 	github.com/fatih/color v1.13.0 // indirect
 	github.com/felixge/httpsnoop v1.0.2 // indirect
@@ -143,7 +143,7 @@ require (
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
-	github.com/prometheus/client_golang v1.12.1 // indirect
+	github.com/prometheus/client_golang v1.12.2-0.20220318110013-3bc8f2c651ff // indirect
 	github.com/prometheus/client_model v0.2.0 // indirect
 	github.com/prometheus/common/sigv4 v0.1.0 // indirect
 	github.com/prometheus/procfs v0.7.3 // indirect
@@ -171,6 +171,7 @@ require (
 	github.com/uber/jaeger-lib v2.4.1+incompatible // indirect
 	github.com/yusufpapurcu/wmi v1.2.2 // indirect
 	go.opencensus.io v0.23.0 // indirect
+	go.opentelemetry.io/collector/pdata v0.50.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.29.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.29.0 // indirect
 	go.opentelemetry.io/contrib/zpages v0.29.0 // indirect
@@ -194,8 +195,8 @@ require (
 	google.golang.org/api v0.72.0 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20220310185008-1973136f34c6 // indirect
-	google.golang.org/grpc v1.45.0 // indirect
-	google.golang.org/protobuf v1.27.1 // indirect
+	google.golang.org/grpc v1.46.0 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.66.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect