build(deps): bump io.opentelemetry.proto:opentelemetry-proto

Bumps [io.opentelemetry.proto:opentelemetry-proto](https://github.com/open-telemetry/opentelemetry-proto-java) from 1.2.0-alpha to 1.3.1-alpha.
- [Release notes](https://github.com/open-telemetry/opentelemetry-proto-java/releases)
- [Commits](https://github.com/open-telemetry/opentelemetry-proto-java/commits)

---
updated-dependencies:
- dependency-name: io.opentelemetry.proto:opentelemetry-proto
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

gradle/libs.versions.toml

@@ -27,7 +27,7 @@ mockito = "5.2.0"
 nimbus = "9.38"
 okhttp = "4.12.0"
 opentelemetry = "1.32.0"
-opentelemetry-proto = "1.2.0-alpha"
+opentelemetry-proto = "1.3.1-alpha"
 postgres = "42.7.3"
 restAssured = "5.4.0"
 rsApi = "4.0.0"