Update codecov/codecov-action digest to fb8b358

Author: renovate[bot]

.github/workflows/tests.yaml

@@ -51,7 +51,7 @@ jobs:
       - name: Run tests with coverage
         run: cargo llvm-cov --cobertura --output-path coverage.xml
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v6
         with:
           files: coverage.xml
           token: ${{ secrets.CODECOV_TOKEN }}