fix(deps): update module cloud.google.com/go/pubsub to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
cloud.google.com/go/pubsub	v1.40.0 → v2.4.0

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[renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 27 additional dependencies were updated
• The go directive was updated for compatibility reasons

Details:

Package	Change
go	1.22.1 -> 1.24.0
cloud.google.com/go	v0.115.0 -> v0.123.0
cloud.google.com/go/auth	v0.6.0 -> v0.18.0
cloud.google.com/go/auth/oauth2adapt	v0.2.2 -> v0.2.8
cloud.google.com/go/compute/metadata	v0.3.0 -> v0.9.0
cloud.google.com/go/iam	v1.1.8 -> v1.5.3
github.com/go-logr/logr	v1.4.1 -> v1.4.3
github.com/google/s2a-go	v0.1.7 -> v0.1.9
github.com/googleapis/enterprise-certificate-proxy	v0.3.2 -> v0.3.7
github.com/googleapis/gax-go/v2	v2.12.5 -> v2.16.0
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc	v0.49.0 -> v0.61.0
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp	v0.49.0 -> v0.61.0
go.opentelemetry.io/otel	v1.24.0 -> v1.39.0
go.opentelemetry.io/otel/metric	v1.24.0 -> v1.39.0
go.opentelemetry.io/otel/trace	v1.24.0 -> v1.39.0
golang.org/x/crypto	v0.24.0 -> v0.46.0
golang.org/x/net	v0.26.0 -> v0.48.0
golang.org/x/oauth2	v0.21.0 -> v0.34.0
golang.org/x/sync	v0.7.0 -> v0.19.0
golang.org/x/sys	v0.21.0 -> v0.39.0
golang.org/x/text	v0.16.0 -> v0.32.0
golang.org/x/time	v0.5.0 -> v0.14.0
google.golang.org/api	v0.186.0 -> v0.259.0
google.golang.org/genproto	v0.0.0-20240617180043-68d350f18fd4 -> v0.0.0-20251202230838-ff82c1b0f217
google.golang.org/genproto/googleapis/api	v0.0.0-20240617180043-68d350f18fd4 -> v0.0.0-20251222181119-0a764e51fe1b
google.golang.org/genproto/googleapis/rpc	v0.0.0-20240617180043-68d350f18fd4 -> v0.0.0-20251222181119-0a764e51fe1b
google.golang.org/grpc	v1.64.0 -> v1.78.0
google.golang.org/protobuf	v1.34.2 -> v1.36.11