ci: remove macos-11 build since it's not supported anymore (#139)

Author: Psycojoker

.github/workflows/build-wheels.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-11, macos-12, macos-13, macos-14, ubuntu-20.04, ubuntu-22.04, ubuntu-24.04]
+        os: [macos-12, macos-13, macos-14, ubuntu-20.04, ubuntu-22.04, ubuntu-24.04]
     runs-on: ${{ matrix.os }}
 
     steps: