Test on view_component 3 by default

It was previously setup to test a release candidate of 3, but version 3 has now been out for more than a year, so we can use 3 by default and test v2 as a single test

.env

@@ -1,6 +1,6 @@
 ALPINE_RUBY_VERSION=3.0.3
 RAILS_VERSION=6.1.4.6
-VIEW_COMPONENT_VERSION=2.66.0
+VIEW_COMPONENT_VERSION=3.12.1
 SOLR_PORT=8983
 SOLR_URL=http://solr:8983/solr/blacklight-core
 SOLR_VERSION=latest

.github/workflows/ruby.yml

@@ -36,7 +36,7 @@ jobs:
         ruby: ['3.0']
         rails_version: ['6.1.7', '7.0.4']
         bootstrap_version: [null]
-        view_component_version: ['~> 2.66']
+        view_component_version: ['~> 3.12']
         api: [null]
         additional_engine_cart_rails_options: ['']
         additional_name: ['']
@@ -59,8 +59,8 @@ jobs:
           rails_version: '7.0.4'
         - ruby: '3.1'
           rails_version: '7.0.4'
-          view_component_version: '~> 3.0.0.rc1'
-          additional_name: '/ ViewComponent 3'
+          view_component_version: '~> 2.66
+          additional_name: '/ ViewComponent 2'
         - ruby: '3.1'
           rails_version: '7.0.4'
           additional_name: '/ Propshaft'