Bump lookbook from 2.3.3 to 2.3.4 (#2680)

Bumps [lookbook](https://github.com/ViewComponent/lookbook) from 2.3.3 to 2.3.4.
- [Release notes](https://github.com/ViewComponent/lookbook/releases)
- [Commits](lookbook-hq/lookbook@v2.3.3...v2.3.4)

---
updated-dependencies:
- dependency-name: lookbook
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -243,10 +243,10 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.10)
     lockbox (1.4.1)
     logger (1.6.1)
-    loofah (2.22.0)
+    loofah (2.23.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
-    lookbook (2.3.3)
+    lookbook (2.3.4)
       activemodel
       css_parser
       htmlbeautifier (~> 1.3)