Drop deprecated MacOS 11 runners

.github/workflows/python-package.yml

@@ -45,18 +45,14 @@ jobs:
 
   tests:
     needs: [pre-commit, mypy]
-    runs-on: macos-11
+    runs-on: macos-12
     steps:
       - uses: actions/checkout@v4
         with:
           submodules: true
       - uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: "12.4"
-      - name: Workaround ARM64 issues
-        # https://github.com/actions/virtual-environments/issues/2557
-        run: |
-          sudo rm -Rf /Library/Developer/CommandLineTools/SDKs/*
+          xcode-version: "14.0"
       - uses: actions/setup-python@v5
         with:
           python-version: "3.x"
@@ -132,12 +128,6 @@ jobs:
       fail-fast: true
       matrix:
         include:
-          - os: "macos-11"
-            xcode: "12.4"
-            python: "3.x"
-          - os: "macos-11"
-            xcode: "13.0"
-            python: "3.x"
           - os: "macos-12"
             xcode: "14.0"
             python: "3.x"