refactor: refactor Github Action per b/485167538 (#2491)

This is a http://go/LSC run by http://go/ghss to automatically refactor
your Github Actions per http://b/485167538.

This is a PR to help you upgrade to the latest standards in Github
Actions.

Please merge this PR to accept the changes. NOTE: if you do not accept
this PR, it may be force merged by the GHSS team. See http://b/485167538
for more details.

Co-authored-by: Ben Knutson <benknutson@google.com>

.github/workflows/deploy_versioned_docs.yaml

@@ -35,7 +35,9 @@ jobs:
           ref: ${{ github.event.release.tag_name }}
 
       - name: Get Version from Release Tag
-        run: echo "VERSION=${{ github.event.release.tag_name }}" >> $GITHUB_ENV
+        run: echo "VERSION=${GITHUB_EVENT_RELEASE_TAG_NAME}" >> $GITHUB_ENV
+        env:
+          GITHUB_EVENT_RELEASE_TAG_NAME: ${{ github.event.release.tag_name }}
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@75d2e84710de30f6ff7268e08f310b60ef14033f # v3