Bump github.com/prometheus/client_golang from 1.14.0 to 1.15.1

Bumps [github.com/prometheus/client_golang](https://github.com/prometheus/client_golang) from 1.14.0 to 1.15.1.
- [Release notes](https://github.com/prometheus/client_golang/releases)
- [Changelog](https://github.com/prometheus/client_golang/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prometheus/client_golang/compare/v1.14.0...v1.15.1)

---
updated-dependencies:
- dependency-name: github.com/prometheus/client_golang
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/google.golang.org/protobuf/proto/doc.go

@@ -5,16 +5,13 @@
 // Package proto provides functions operating on protocol buffer messages.
 //
 // For documentation on protocol buffers in general, see:
-//
-//	https://developers.google.com/protocol-buffers
+// https://protobuf.dev.
 //
 // For a tutorial on using protocol buffers with Go, see:
-//
-//	https://developers.google.com/protocol-buffers/docs/gotutorial
+// https://protobuf.dev/getting-started/gotutorial.
 //
 // For a guide to generated Go protocol buffer code, see:
-//
-//	https://developers.google.com/protocol-buffers/docs/reference/go-generated
+// https://protobuf.dev/reference/go/go-generated.
 //
 // # Binary serialization
 //