ci: Upgrade GitHub Actions to latest versions

Merge google#4427

## Summary

Upgrade GitHub Actions to their latest versions for improved features, bug fixes, and security updates.

## Changes

| Action | Old Version(s) | New Version | Release | Files |
|--------|---------------|-------------|---------|-------|
| `astral-sh/setup-uv` | [`v1`](https://github.com/astral-sh/setup-uv/releases/tag/v1), [`v5`](https://github.com/astral-sh/setup-uv/releases/tag/v5), [`v6`](https://github.com/astral-sh/setup-uv/releases/tag/v6) | [`v7`](https://github.com/astral-sh/setup-uv/releases/tag/v7) | [Release](https://github.com/astral-sh/setup-uv/releases/tag/v7) | mypy-new-errors.yml, mypy.yml, python-unit-tests.yml |
| `webfactory/ssh-agent` | [`v0.9.0`](https://github.com/webfactory/ssh-agent/releases/tag/v0.9.0) | [`v0.9.1`](https://github.com/webfactory/ssh-agent/releases/tag/v0.9.1) | [Release](https://github.com/webfactory/ssh-agent/releases/tag/v0) | analyze-releases-for-adk-docs-updates.yml |

## Why upgrade?

Keeping GitHub Actions up to date ensures:
- **Security**: Latest security patches and fixes
- **Features**: Access to new functionality and improvements
- **Compatibility**: Better support for current GitHub features
- **Performance**: Optimizations and efficiency improvements

### Security Note

Actions that were previously pinned to commit SHAs remain pinned to SHAs (updated to the latest release SHA) to maintain the security benefits of immutable references.

### Testing

These changes only affect CI/CD workflow configurations and should not impact application functionality. The workflows should be tested by running them on a branch before merging.

COPYBARA_INTEGRATE_REVIEW=google#4427 from salmanmkc:upgrade-github-actions-node24-general 4aacbae
PiperOrigin-RevId: 868263909

Author: salmanmkc

.github/workflows/analyze-releases-for-adk-docs-updates.yml

@@ -24,7 +24,7 @@ jobs:
           python-version: '3.11'
 
       - name: Load adk-bot SSH Private Key
-        uses: webfactory/ssh-agent@v0.9.0
+        uses: webfactory/ssh-agent@v0.9.1
         with:
           ssh-private-key: ${{ secrets.ADK_BOT_SSH_PRIVATE_KEY }}
 

.github/workflows/mypy-new-errors.yml

@@ -25,7 +25,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v7
 
       - name: Generate Baseline (Main)
         run: |

.github/workflows/mypy.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v1
+        uses: astral-sh/setup-uv@v7
 
       - name: Set up Python
         uses: actions/setup-python@v5

.github/workflows/python-unit-tests.yml

@@ -37,7 +37,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Install the latest version of uv
-      uses: astral-sh/setup-uv@v6
+      uses: astral-sh/setup-uv@v7
 
     - name: Install dependencies
       run: |