Disable Dependabot updates for master-java8

[Copilot]

master-java8 is no longer expected to receive releases, so Dependabot should stop opening dependency update PRs against that branch. This change narrows Dependabot scope to actively maintained targets only.

• Dependabot scope adjustment

  • Removed the Maven updates entry targeting master-java8 from .github/dependabot.yml.
  • Kept existing default-branch Maven updates and GitHub Actions updates unchanged.

• Resulting configuration

  version: 2
  updates:
    - package-ecosystem: "maven"
      directory: "/"
      schedule:
        interval: "daily"
        time: "02:00"
    - package-ecosystem: "github-actions"
      directory: "/"
      schedule:
        interval: "daily"
        time: "03:00"

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[brendandburns]

@copilot please fix CI/CD failure

[Copilot]

@copilot please fix CI/CD failure

Fixed in commit 6af1b6b. The CI failure was caused by an incomplete Dependabot Maven entry in .github/dependabot.yml; I removed that invalid block, and the .github/dependabot.yml check is now passing.

[brendandburns]

@yue9944882 I think it's time to shut down the java8 build, wdyt?