chore(deps): bump the bundler group with 2 updates

Bumps the bundler group with 2 updates: [nokogiri](https://github.com/sparklemotion/nokogiri) and [rubocop-ast](https://github.com/rubocop/rubocop-ast).


Updates `nokogiri` from 1.18.3 to 1.18.4
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.18.4/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.18.3...v1.18.4)

Updates `rubocop-ast` from 1.38.1 to 1.39.0
- [Release notes](https://github.com/rubocop/rubocop-ast/releases)
- [Changelog](https://github.com/rubocop/rubocop-ast/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-ast@v1.38.1...v1.39.0)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: bundler
- dependency-name: rubocop-ast
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: bundler
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -168,9 +168,9 @@ GEM
     net-smtp (0.5.1)
       net-protocol
     nkf (0.2.0)
-    nokogiri (1.18.3-x64-mingw-ucrt)
+    nokogiri (1.18.4-x64-mingw-ucrt)
       racc (~> 1.4)
-    nokogiri (1.18.3-x86_64-linux-gnu)
+    nokogiri (1.18.4-x86_64-linux-gnu)
       racc (~> 1.4)
     observer (0.1.2)
     octokit (9.2.0)
@@ -262,7 +262,7 @@ GEM
       rexml
     rubocop (0.7.2)
       rainbow (>= 1.1.4)
-    rubocop-ast (1.38.1)
+    rubocop-ast (1.39.0)
       parser (>= 3.3.1.0)
     ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)