Remove Ruby 2.5 from test matrix.

Author: ioquatix

.github/workflows/test.yaml

@@ -21,7 +21,6 @@ jobs:
           - macos
 
         ruby:
-          - "2.5"
           - "2.6"
           - "2.7"
           - "3.0"
@@ -42,10 +41,6 @@ jobs:
           - os: ubuntu
             ruby: head
             experimental: true
-        exclude:
-          # Not supported on macos-arm64:
-          - os: macos
-            ruby: "2.5"
 
     steps:
     - uses: actions/checkout@v5