Merge pull request redhat-documentation#845 from redhat-documentation/dependabot/github_actions/actions/cache-4

Bump actions/cache from 2 to 4

Author: aireilly

.github/workflows/preview-build.yml

@@ -66,7 +66,7 @@ jobs:
             PR_NUMBER
             PR_SHA
           retention-days: 7
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4
         with:
           path: tmp/.htmltest
           key: ${{ runner.os }}-htmltest