Update rubocop requirement from ~> 1.39.0 to ~> 1.40.0

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.39.0...v1.40.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -43,7 +43,7 @@ GEM
       rspec (>= 2.99.0, < 4.0)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
-    json (2.6.2)
+    json (2.6.3)
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -90,7 +90,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.12.0)
     rspec-support (3.12.0)
-    rubocop (1.39.0)
+    rubocop (1.40.0)
       json (~> 2.3)
       parallel (~> 1.10)
       parser (>= 3.1.2.1)
@@ -100,7 +100,7 @@ GEM
       rubocop-ast (>= 1.23.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.23.0)
+    rubocop-ast (1.24.0)
       parser (>= 3.1.1.0)
     rubocop-performance (1.15.1)
       rubocop (>= 1.7.0, < 2.0)
@@ -135,7 +135,7 @@ DEPENDENCIES
   rake (~> 13.0)
   rspec (~> 3.0)
   rspec-collection_matchers (~> 1.2.0)
-  rubocop (~> 1.39.0)
+  rubocop (~> 1.40.0)
   rubocop-performance (~> 1.15.0)
   rubocop-rspec (~> 2.15.0)
   simplecov (~> 0.21.2)

proforma.gemspec

@@ -52,7 +52,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'rspec-collection_matchers', '~> 1.2.0'
-  spec.add_development_dependency 'rubocop', '~> 1.39.0'
+  spec.add_development_dependency 'rubocop', '~> 1.40.0'
   spec.add_development_dependency 'rubocop-performance', '~> 1.15.0'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.15.0'
   spec.add_development_dependency 'simplecov', '~> 0.21.2'