drop macos-13 in ci. Add -15 to tests but not wheels

Author: molpopgen

.github/workflows/macos_CI.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         python: [ "3.12", "3.13" ]
-        os:  [ macos-14, macos-13 ]
+        os:  [ macos-14, macos-15 ]
         rust: [1.62.1]
     defaults:
       run:

.github/workflows/wheels.yml

@@ -47,7 +47,7 @@ jobs:
     strategy:
       matrix:
         rust: [1.62.1]
-        os: [macos-14, macos-13]
+        os: [macos-14]
     steps:
       - name: Cancel Previous Runs
         uses: styfle/cancel-workflow-action@0.12.1
@@ -181,7 +181,7 @@ jobs:
     strategy:
       matrix:
         python: ["3.12", "3.13"]
-        os: [macos-14, macos-13]
+        os: [macos-14]
     steps:
       - name: Cancel Previous Runs
         uses: styfle/cancel-workflow-action@0.12.1