exclude macos-13 from matrix

Author: albertedwardson

.github/workflows/tests-macos.yml

@@ -10,14 +10,11 @@ on:
 
 jobs:
   tests:
-    runs-on: ${{ matrix.os }}
+    runs-on: macos-latest
 
     strategy:
       fail-fast: false
       matrix:
-        os:
-          - macos-latest
-          - macos-13
         python-version:
           - "3.9"
           - "3.10"