Bump the ruby-deps group across 1 directory with 3 updates

Bumps the ruby-deps group with 3 updates in the / directory: [rack](https://github.com/rack/rack), [rake](https://github.com/ruby/rake) and [rspec-mocks](https://github.com/rspec/rspec).


Updates `rack` from 2.2.20 to 2.2.21
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.20...v2.2.21)

Updates `rake` from 13.3.0 to 13.3.1
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v13.3.0...v13.3.1)

Updates `rspec-mocks` from 3.13.6 to 3.13.7
- [Changelog](https://github.com/rspec/rspec/blob/rspec-mocks-v3.13.7/rspec-mocks/Changelog.md)
- [Commits](rspec/rspec@rspec-mocks-v3.13.6...rspec-mocks-v3.13.7)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 2.2.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ruby-deps
- dependency-name: rake
  dependency-version: 13.3.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: ruby-deps
- dependency-name: rspec-mocks
  dependency-version: 3.13.7
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: ruby-deps
...

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

Author: dependabot[bot]

Gemfile

@@ -4,7 +4,7 @@ group :default do
   if rack_version = ENV['RACK_VERSION']
     gem 'rack', rack_version
   else
-    gem 'rack', '~> 2.2.20'
+    gem 'rack', '~> 2.2.21'
   end
 end
 

Gemfile.lock

@@ -6,8 +6,8 @@ GEM
       rake
       thor (>= 0.14.0)
     diff-lcs (1.6.2)
-    rack (2.2.20)
-    rake (13.3.0)
+    rack (2.2.21)
+    rake (13.3.1)
     rspec (3.13.2)
       rspec-core (~> 3.13.0)
       rspec-expectations (~> 3.13.0)
@@ -17,7 +17,7 @@ GEM
     rspec-expectations (3.13.5)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.6)
+    rspec-mocks (3.13.7)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.6)
@@ -33,6 +33,6 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal
-  rack (~> 2.2.20)
+  rack (~> 2.2.21)
   rake (~> 13.3)
   rspec