ruby: bump rake from 13.0.6 to 13.1.0

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:production
  update-type: version-update:semver-minor
...

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

Gemfile

@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-gem "rake", "~>13.0"
+gem "rake", "~>13.1"
 gem "rspec", "~> 3"
 gem "rubocop-govuk", "~> 4"
 

Gemfile.lock

@@ -19,7 +19,7 @@ GEM
       ast (~> 2.4.1)
     rack (3.0.6.1)
     rainbow (3.1.1)
-    rake (13.0.6)
+    rake (13.1.0)
     regexp_parser (2.6.1)
     rexml (3.2.5)
     rspec (3.12.0)
@@ -73,7 +73,7 @@ PLATFORMS
 
 DEPENDENCIES
   net-ssh (>= 7)
-  rake (~> 13.0)
+  rake (~> 13.1)
   rspec (~> 3)
   rubocop-govuk (~> 4)