ci: update codecov-action to v3 (#170)

Author: felix-seifert

.github/workflows/pullrequest.yml

@@ -42,6 +42,6 @@ jobs:
           package
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v2
+        uses: codecov/codecov-action@v3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}

.github/workflows/release.yml

@@ -41,6 +41,6 @@ jobs:
           GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v2
+        uses: codecov/codecov-action@v3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}