Bump rexml from 3.3.3 to 3.3.4 in /.overcommit

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.3 to 3.3.4.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.3.3...v3.3.4)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

.overcommit/Gemfile.lock

@@ -27,7 +27,7 @@ GEM
     racc (1.8.0)
     rainbow (3.1.1)
     regexp_parser (2.9.2)
-    rexml (3.3.3)
+    rexml (3.3.4)
       strscan
     rubocop (1.65.0)
       json (~> 2.3)