Update GitHub Actions workflows. (#754)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit c35a5080844ba9575ace11ac9b700a27676672ed.

Author: pulumi-bot

.github/workflows/build_sdk.yml

@@ -49,7 +49,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Cache examples generation
-        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4
+        uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4
         with:
           path: |
             .pulumi/examples-cache

.github/workflows/prerequisites.yml

@@ -54,7 +54,7 @@ jobs:
         major-version: 3
         set-env: 'PROVIDER_VERSION'
     - name: Cache examples generation
-      uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4
+      uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4
       with:
         path: |
           .pulumi/examples-cache