Fix Playground CI Nightly job

[Amar3tto]

Fixes: #30612
Successful run: https://github.com/apache/beam/actions/runs/18977472525/job/54200883194

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Summary of Changes

Hello @Amar3tto, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a failure in the Playground CI Nightly job by updating critical dependencies and environment configurations. The changes primarily involve upgrading Go language versions and related tooling, as well as updating the Java Runtime Environment used within the Go backend Docker container. These updates aim to resolve compatibility issues and ensure the stability and successful execution of the nightly CI pipeline.

Highlights

• Go Version Updates: The Go environment has been updated across several configurations. The actions/setup-go action was upgraded from v5 to v6, the default Go version in the setup action is now 1.25, the go.mod file for mock APIs now specifies Go 1.25.0 and toolchain 1.25.2, and the Docker base image for Go containers has been updated to golang:1.25.
• Java Runtime Environment Upgrade: The Java Runtime Environment (JRE) installed in the Go backend Docker container has been upgraded from OpenJDK 11 to OpenJDK 21, ensuring compatibility with newer Java features and security updates.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/beam_Playground_CI_Nightly.yml

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[Abacn]

thanks!