chore(deps): 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/buildtest.yml

@@ -114,7 +114,7 @@ jobs:
           covimerage write_coverage "${THEMIS_PROFILE}"
           coverage xml
       - name: Send coverage
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           file: ./coverage.xml
           env_vars: OS,VIMVER
@@ -230,7 +230,7 @@ jobs:
           covimerage write_coverage ${Env:THEMIS_PROFILE}
           coverage xml
       - name: Send coverage
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           file: ./coverage.xml
           env_vars: OS,VIMVER