chore: update CI actions

Signed-off-by: Christian Walter <[email protected]>

Author: walterchris

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
@@ -39,20 +39,20 @@ jobs:
       run: make singlehtml
 
     - name: upload
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: artifacts
         path: |
           build/latex/fit-specification-*.pdf
 
     - name: deploy
-      uses: peaceiris/actions-gh-pages@v3
+      uses: peaceiris/actions-gh-pages@v4
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
         publish_dir: ./build/singlehtml
 
     - name: release
-      uses: softprops/action-gh-release@v1
+      uses: softprops/action-gh-release@v2
       if: startsWith(github.ref, 'refs/tags/')
       with:
         files: build/latex/fit-specification-*.pdf