Revert MacOS changes

Author: crusaderky

.github/workflows/tests.yaml

@@ -33,6 +33,18 @@ jobs:
         partition: [ci1, not ci1]
 
         exclude:
+          # MacOS CI does not have many hosts available; run it on 3.14 only
+          - os: macos-latest
+            environment: mindeps
+          - os: macos-latest
+            environment: "3.10"
+          - os: macos-latest
+            environment: "3.11"
+          - os: macos-latest
+            environment: "3.12"
+          - os: macos-latest
+            environment: "3.13"
+
           - os: windows-latest
             environment: mindeps