Bump peter-evans/find-comment from 3 to 4

Bumps [peter-evans/find-comment](https://github.com/peter-evans/find-comment) from 3 to 4.
- [Release notes](https://github.com/peter-evans/find-comment/releases)
- [Commits](https://github.com/peter-evans/find-comment/compare/v3...v4)

---
updated-dependencies:
- dependency-name: peter-evans/find-comment
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/cd-staging.yml

@@ -331,7 +331,7 @@ jobs:
       # than spamming a new one each push. The marker line at the bottom of
       # the body is what `body-includes` matches on.
       - name: Find existing preview comment
-        uses: peter-evans/find-comment@v3
+        uses: peter-evans/find-comment@v4
         id: find-comment
         with:
           issue-number: ${{ github.event.number }}
@@ -424,7 +424,7 @@ jobs:
             docker compose exec -T caddy caddy reload --config /etc/caddy/Caddyfile || true
 
       - name: Find existing preview comment
-        uses: peter-evans/find-comment@v3
+        uses: peter-evans/find-comment@v4
         id: find-comment
         with:
           issue-number: ${{ github.event.number }}