build(deps-dev): bump rexml in /utilities/build-tools

Bumps [rexml](https://github.com/ruby/rexml) from 3.3.6 to 3.3.9.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](ruby/rexml@v3.3.6...v3.3.9)

---
updated-dependencies:
- dependency-name: rexml
  dependency-type: indirect
...

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

utilities/build-tools/Gemfile.lock

@@ -45,8 +45,7 @@ GEM
     regexp_parser (2.8.0)
     reline (0.3.5)
       io-console (~> 0.5)
-    rexml (3.3.6)
-      strscan
+    rexml (3.3.9)
     rubocop (1.52.0)
       json (~> 2.3)
       parallel (~> 1.10)
@@ -60,7 +59,6 @@ GEM
     rubocop-ast (1.29.0)
       parser (>= 3.2.1.0)
     ruby-progressbar (1.13.0)
-    strscan (3.1.0)
     twitter_cldr (6.11.5)
       camertron-eprun
       cldr-plurals-runtime-rb (~> 1.1)