chore(deps): Bump andstor/file-existence-action from 2 to 3

Bumps [andstor/file-existence-action](https://github.com/andstor/file-existence-action) from 2 to 3.
- [Release notes](https://github.com/andstor/file-existence-action/releases)
- [Commits](andstor/file-existence-action@v2...v3)

---
updated-dependencies:
- dependency-name: andstor/file-existence-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/tests.yaml

@@ -33,7 +33,7 @@ jobs:
 
       - name: Check for .codecov.yaml
         id: codecov-enabled
-        uses: andstor/file-existence-action@v2
+        uses: andstor/file-existence-action@v3
         with:
           files: .codecov.yaml