Bump rossjrw/pr-preview-action from 1.6.3 to 1.7.2

Bumps [rossjrw/pr-preview-action](https://github.com/rossjrw/pr-preview-action) from 1.6.3 to 1.7.2.
- [Release notes](https://github.com/rossjrw/pr-preview-action/releases)
- [Commits](rossjrw/pr-preview-action@8ff09e4...3e4ed15)

---
updated-dependencies:
- dependency-name: rossjrw/pr-preview-action
  dependency-version: 1.7.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/preview.yml

@@ -48,7 +48,7 @@ jobs:
             --minify \
             --baseURL "https://trailofbits.github.io/testing-handbook-preview/pr-preview/pr-${{ github.event.number }}/"
       - name: Deploy preview
-        uses: rossjrw/pr-preview-action@8ff09e486b4c23709012eedd3b42e9f0b95dd0c5 # v1
+        uses: rossjrw/pr-preview-action@3e4ed158ecbf7f58513abc0dc15a4ad3b0e18ee5 # v1
         with:
           source-dir: ./public/
           token: ${{ secrets.TESTING_HANDBOOK_PREVIEW_REPO }}