Remove Ruby 3.0 build from CI

We don't set a required ruby version in the gemspec so taking the liberty to drop Ruby 3.0 from CI to lessen the burden of gemfile management. Several dependencies have since had new releases that have different Ruby version requirements (sqlite, zeitwerk, sass-embedded, net-imap, etc.) making it difficult to install a common demoninator that will run for all CI builds. Existing PRs have failed CI due to this.

.github/workflows/ci.yml

@@ -6,7 +6,6 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - "3.0"
           - "3.1"
           - "3.2"
           - "3.3"
@@ -19,10 +18,6 @@ jobs:
           - gemfiles/rails_7_1_sprockets.gemfile
           - gemfiles/rails_main_sprockets.gemfile
         exclude:
-          - ruby-version: "3.0"
-            gemfile: gemfiles/rails_main_propshaft.gemfile
-          - ruby-version: "3.0"
-            gemfile: gemfiles/rails_main_sprockets.gemfile
           - ruby-version: "3.1"
             gemfile: gemfiles/rails_main_propshaft.gemfile
           - ruby-version: "3.1"