[DOWNSTREAM TEST] Update GitHub Actions workflows. (#721)

This PR was automatically generated by the pull-request workflow in the
pulumi/ci-mgmt repo, from commit
962009a157587c5c11d686e51206a2d312bc4618.

Author: pulumi-bot

.github/actions/setup-tools/action.yml

@@ -20,7 +20,7 @@ runs:
         cache_save: ${{ inputs.cache }}
 
     - name: Setup Go Cache
-      uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # v5.5.0
+      uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
       with:
         cache: ${{ inputs.cache }}
         cache-dependency-path: |