fix: add projen action overrides to prevent self-mutation with setup-java and setup-dotnet v4

[archit017]

Summary

Fixes self-mutation issue where actions/setup-java and actions/setup-dotnet were being reverted from v4 to v3 during CI builds.

Changes

Added projen action version overrides in .projenrc.ts:

project.github?.actions.set("actions/setup-java", "actions/setup-java@v4");
project.github?.actions.set("actions/setup-dotnet", "actions/setup-dotnet@v4");

Why This Fix Works

The self-mutation issue occurred because:

1. The workflow files were manually updated to use v4 versions
2. Projen's default versions are v3, so when npx projen ran during CI builds, it regenerated the workflows with v3, causing a diff
3. This fix configures projen to always use v4 for these actions, preventing future self-mutation

Testing

• Ran npx projen locally and verified workflow files maintain v4 versions
• No changes to workflow files when regenerating (no self-mutation)