build(deps-dev): bump rake from 13.0.6 to 13.1.0 in /gemfiles/rails-6.1

Bumps [rake](https://github.com/ruby/rake) from 13.0.6 to 13.1.0.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v13.0.6...v13.1.0)

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

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

gemfiles/rails-6.1/Gemfile

@@ -9,7 +9,7 @@ gem "rails", "~> 6.1.7"
 # keep in sync with ../../Gemfile
 group :development, :test do
   gem "combustion"
-  gem "rake", "~> 13.0"
+  gem "rake", "~> 13.1"
   gem "rspec", "~> 3.0"
   gem "rspec-rails"
 end

gemfiles/rails-6.1/Gemfile.lock

@@ -150,7 +150,7 @@ GEM
       method_source
       rake (>= 12.2)
       thor (~> 1.0)
-    rake (13.0.6)
+    rake (13.1.0)
     rspec (3.12.0)
       rspec-core (~> 3.12.0)
       rspec-expectations (~> 3.12.0)
@@ -196,7 +196,7 @@ DEPENDENCIES
   combustion
   pry-byebug
   rails (~> 6.1.7)
-  rake (~> 13.0)
+  rake (~> 13.1)
   rspec (~> 3.0)
   rspec-rails
   texd!