Update GitHub Actions workflows. (#1082)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit ea6479fcbca4b3b86182ffdd8731b26746795508.

Author: pulumi-bot

.github/workflows/build_sdk.yml

@@ -51,7 +51,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Cache examples generation
-        uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f # v4
+        uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4
         with:
           path: |
             .pulumi/examples-cache

.github/workflows/prerequisites.yml

@@ -56,7 +56,7 @@ jobs:
         major-version: 5
         set-env: 'PROVIDER_VERSION'
     - name: Cache examples generation
-      uses: actions/cache@0c907a75c2c80ebcb7f088228285e798b750cf8f # v4
+      uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4
       with:
         path: |
           .pulumi/examples-cache