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](https://github.com/ruby/rake/compare/v10.5.0...v12.3.3)

---
updated-dependencies:
- dependency-name: rake
  dependency-type: direct:development
...

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

Gemfile.lock

@@ -80,7 +80,7 @@ GEM
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
     racc (1.6.0)
-    rake (10.5.0)
+    rake (12.3.3)
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -102,7 +102,7 @@ PLATFORMS
 DEPENDENCIES
   bundler
   jekyll-text-theme!
-  rake (~> 10.0)
+  rake (~> 12.3)
 
 BUNDLED WITH
    2.1.4