CI: bump actions

- Bump upload-artifact to v7
- Bump action-gh-release to v3

Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>

Author: vstehle

.github/workflows/main.yaml

@@ -106,7 +106,7 @@ jobs:
         run: make text
 
       - name: 'Upload artifacts'
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: ebbr-${{ env.EBBR_VERSION }}
           path: |
@@ -123,7 +123,7 @@ jobs:
           publish_dir: ./build/singlehtml
 
       - name: 'Publish Release'
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@v3
         if: endsWith(github.ref, env.EBBR_VERSION)
         with:
           files: build/ebbr-*.pdf