Update rake requirement from ~> 10.0 to ~> 12.3

Updates the requirements on [rake](https://github.com/ruby/rake) to permit the latest version.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](ruby/rake@v10.5.0...v12.3.3)

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

Author: dependabot[bot]

Gemfile.lock

@@ -84,7 +84,7 @@ GEM
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
     racc (1.5.2)
-    rake (10.5.0)
+    rake (12.3.3)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -113,7 +113,7 @@ PLATFORMS
 DEPENDENCIES
   bundler
   jekyll-text-theme!
-  rake (~> 10.0)
+  rake (~> 12.3)
   tzinfo-data
   wdm (= 0.1.1)
   webrick (~> 1.7)

jekyll-text-theme.gemspec

@@ -23,5 +23,5 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "jemoji", "~> 0.8"
 
   spec.add_development_dependency "bundler"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rake", "~> 12.3"
 end