chore: DEVPLAT-7373 fix Node.js 20 deprecated GitHub Actions

[kristianmills]

Summary

Upgrades GitHub Actions that use the deprecated Node.js 20 runtime to Node.js 24 compatible versions.

Node.js 20 actions will be forced to run on Node.js 24 by default starting June 2nd, 2026. See the GitHub deprecation notice.

Changes made:

• amannn/action-semantic-pull-request@v5 → amannn/action-semantic-pull-request@v6
• cycjimmy/semantic-release-action@v3 → cycjimmy/semantic-release-action@v5

🤖 Generated with Claude Code

DEVPLAT-7373

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Note

Low Risk
Low risk: CI-only workflow updates, but changes to release tooling (semantic-release) could affect versioning/changelog output if misconfigured.

Overview
Updates GitHub Actions workflow dependencies to newer major versions to stay compatible with upcoming runner Node.js runtime changes.

Release workflow bumps pnpm/action-setup and cycjimmy/semantic-release-action, upgrades semantic-release to v24, and pins @semantic-release/* plugin versions. PR test workflow also updates pnpm/action-setup, upgrades git-auto-commit-action, and explicitly checks out the PR head ref; PR title validation updates action-semantic-pull-request to v6.

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