ci: upgrade test runners

Author: g105b

.github/workflows/ci.yml

@@ -97,6 +97,7 @@ jobs:
         uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+          slug: ${{ github.repository }}
 
   phpstan:
     runs-on: ubuntu-latest
@@ -168,9 +169,3 @@ jobs:
           php_version: ${{ matrix.php }}
           path: src/
           standard: phpcs.xml
-
-  remove_old_artifacts:
-    runs-on: ubuntu-latest
-
-    permissions:
-      actions: write