CI: Remove Ruby 2.5 (EOL) from matrix

Quotes around 3.0 avoid YAML conversion issue.

Author: olleolleolle

.github/workflows/development.yml

@@ -14,10 +14,9 @@ jobs:
  - macos
 
  ruby:
- - 2.5
  - 2.6
  - 2.7
- - 3.0
+ - "3.0"
 
  experimental: [false]
  env: [""]