ci: update GitHub Actions to latest versions

Update outdated GitHub Actions dependencies to address dependabot PRs that were closed due to inactivity:
- actions/first-interaction: v1 → v3
- actions/labeler: v5 → v6
- actions/setup-python: v4 → v6
- codecov/codecov-action: v3 → v5
- actions/stale: v9 → v10

Also created missing labels (dependencies, github-actions) that dependabot requires for proper PR labeling.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: jwesleye

.github/workflows/greet.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Greet first-time contributor
-        uses: actions/first-interaction@v1
+        uses: actions/first-interaction@v3
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
 

.github/workflows/labeler.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Label based on changed files
-        uses: actions/labeler@v5
+        uses: actions/labeler@v6
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           configuration-path: .github/labeler.yml

.github/workflows/stale.yml

@@ -14,7 +14,7 @@ jobs:
       pull-requests: write
 
     steps:
-    - uses: actions/stale@v9
+    - uses: actions/stale@v10
       with:
         # General settings
         repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -40,7 +40,7 @@ jobs:
       run: pytest --cov=src/coding_open_agent_tools --cov-report=xml --cov-report=term-missing
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v5
       if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.11'
       with:
         files: ./coverage.xml