Bump libxml-ruby from 3.2.0 to 3.2.1

Bumps [libxml-ruby](https://github.com/xml4r/libxml-ruby) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/xml4r/libxml-ruby/releases)
- [Changelog](https://github.com/xml4r/libxml-ruby/blob/master/HISTORY)
- [Commits](xml4r/libxml-ruby@v3.2.0...v3.2.1)

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

Gemfile.lock

@@ -253,7 +253,7 @@ GEM
     kgio (2.11.3)
     kramdown (2.3.0)
       rexml
-    libxml-ruby (3.2.0)
+    libxml-ruby (3.2.1)
     listen (3.2.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)