Pin the version of the release verification tests

Closes gh-40366

Author: wilkinsona

.github/workflows/verify.yml

@@ -14,7 +14,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: spring-projects/spring-boot-release-verification
-          ref: 'main'
+          ref: 'v0.0.2'
           token: ${{ secrets.GH_ACTIONS_REPO_TOKEN }}
       - name: Check Out Send Notification Action
         uses: actions/checkout@v4