ci(dependabot): bump codecov/codecov-action from 4 to 5

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4 to 5.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4...v5)

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

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

.github/workflows/ci.yml

@@ -65,7 +65,7 @@ jobs:
           update_existing: true
 
       - name: Coverage
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
 
   deploy:
     name: Deploy

.github/workflows/tests.yml

@@ -28,4 +28,4 @@ jobs:
         pytest --color=yes --cov=cellmap_models --cov-report=xml --cov-report=term-missing tests
     # Coverage should work out of the box for public repos. For private repos, more setup is likely required.
     - name: Coverage
-      uses: codecov/codecov-action@v4
+      uses: codecov/codecov-action@v5