Exclude failing 1.9 and macos for >2.7

.github/workflows/tests.yaml

@@ -14,7 +14,6 @@ jobs:
       matrix:
         ruby:
           # Due to https://github.com/actions/runner/issues/849, 'x.0' versions have to use quotes
-          - 1.9
           - '2.0'
           - 2.1
           - 2.2
@@ -32,8 +31,14 @@ jobs:
           - ubuntu
           - windows
         exclude:
-          - ruby: 1.9
-            os: windows
+          - ruby: 2.2 # Fails on setup: https://github.com/rvm/gem-empty/actions/runs/5094962600/jobs/9159397472
+            os: ubuntu
+          - ruby: 2.7 # Fails only on macos: https://github.com/rvm/gem-empty/actions/runs/5094962600/jobs/9159397472
+            os: macos
+          - ruby: 3.0 # Fails only on macos: https://github.com/rvm/gem-empty/actions/runs/5094962600/jobs/9159398902
+            os: macos
+          - ruby: 3.1 # Fails only on macos: https://github.com/rvm/gem-empty/actions/runs/5094962600/jobs/9159399155
+            os: macos
           - ruby: jruby
             os: macos
           - ruby: jruby