build(deps): bump rubytree from 2.1.0 to 2.1.1

Bumps [rubytree](https://github.com/evolve75/RubyTree) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/evolve75/RubyTree/releases)
- [Changelog](https://github.com/evolve75/RubyTree/blob/master/API-CHANGES.md)
- [Commits](evolve75/RubyTree@R2.1.0...R2.1.1)

---
updated-dependencies:
- dependency-name: rubytree
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -1058,8 +1058,8 @@ GEM
       nokogiri (>= 1.13.10)
       rexml
     ruby2_keywords (0.0.5)
-    rubytree (2.1.0)
-      json (~> 2.0, > 2.3.1)
+    rubytree (2.1.1)
+      json (~> 2.0, > 2.9)
     rubyzip (2.3.2)
     safety_net_attestation (0.4.0)
       jwt (~> 2.0)