Update GitHub Actions workflows. (#560)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit 5610283a822c5ed77127abb5942c8116ea1de49f.

.github/workflows/weekly-pulumi-update.yml

@@ -62,7 +62,7 @@ jobs:
       with:
         repo: pulumi/pulumictl
     - name: Install Pulumi CLI
-      uses: pulumi/actions@cc7494be991dba0978f7ffafaf995b0449a0998e # v6.5.0
+      uses: pulumi/actions@df5a93ad715135263c732ba288301bd044c383c0 # v6.3.0
     - name: Setup DotNet
       uses: actions/setup-dotnet@67a3573c9a986a3f9c594539f4ab511d57bb3ce9 # v4.3.1
       with: