Bump rexml from 3.2.5 to 3.2.6 in /.overcommit

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.5 to 3.2.6.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.2.5...v3.2.6)

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

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

.overcommit/Gemfile.lock

@@ -37,7 +37,7 @@ GEM
     rack (2.2.3)
     rainbow (3.1.1)
     regexp_parser (2.3.1)
-    rexml (3.2.5)
+    rexml (3.2.6)
     rubocop (1.29.0)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)