Merge pull request #267 from rspec/add-3.0.0-rc1-to-4-0-dev

Add 3.0.0-rc1 (for 4-0-dev)

Author: JonRowe

ci/.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 3.0.0-preview2
+          - 3.0.0-rc1
           - 2.7
           - 2.6
           - 2.5