Bump rexml from 3.2.9 to 3.3.6

Bumps [rexml](https://github.com/ruby/rexml) from 3.2.9 to 3.3.6.
- [Release notes](https://github.com/ruby/rexml/releases)
- [Changelog](https://github.com/ruby/rexml/blob/master/NEWS.md)
- [Commits](https://github.com/ruby/rexml/compare/v3.2.9...v3.3.6)

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

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

Gemfile.lock

@@ -238,7 +238,7 @@ GEM
       trailblazer-option (>= 0.1.1, < 0.2.0)
       uber (< 0.2.0)
     retriable (3.1.2)
-    rexml (3.2.9)
+    rexml (3.3.6)
       strscan
     rouge (2.0.7)
     ruby-macho (2.5.1)
@@ -272,13 +272,13 @@ GEM
     xcode-install (2.8.1)
       claide (>= 0.9.1)
       fastlane (>= 2.1.0, < 3.0.0)
-    xcodeproj (1.24.0)
+    xcodeproj (1.25.0)
       CFPropertyList (>= 2.3.3, < 4.0)
       atomos (~> 0.1.3)
       claide (>= 1.0.2, < 2.0)
       colored2 (~> 3.1)
       nanaimo (~> 0.3.0)
-      rexml (~> 3.2.4)
+      rexml (>= 3.3.2, < 4.0)
     xcpretty (0.3.0)
       rouge (~> 2.0.7)
     xcpretty-travis-formatter (1.0.1)