Update GitHub Actions workflows. (#5558)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit 9983e5b04e591b71339227336332131e8fda153d.

Author: pulumi-bot

.github/workflows/prerequisites.yml

@@ -83,7 +83,7 @@ jobs:
     - name: Unit-test provider code
       run: make test_provider
     - name: Upload coverage reports to Codecov
-      uses: codecov/codecov-action@ad3126e916f78f00edff4ed0317cf185271ccc2d # v5.4.2
+      uses: codecov/codecov-action@18283e04ce6e62d37312384ff67231eb8fd56d24 # v5.4.3
       env:
         CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
     - if: inputs.is_pr