CI, remove macos-11

.github/workflows/Main.yml

@@ -54,39 +54,6 @@ jobs:
       run: cd build && ctest --output-on-failure -j 2
     - name: Run simple test
       run: mod -e "smiles('O').print()"
-  macOS-11:
-    runs-on: macos-11
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-        submodules: 'recursive'
-    - name: Install Brew dependencies
-      run: brew bundle
-    - name: Install pip dependencies
-      run: pip3 install -r requirements.txt
-    - name: Set PATH
-      run: |
-        /usr/libexec/path_helper | sed -e 's/^PATH="//' -e 's/"; export PATH;//' | tr ":" "\n"  | tail -r >> $GITHUB_PATH
-        python3 -c 'import os,sysconfig;print(sysconfig.get_path("scripts",f"{os.name}_prefix"))' >> $GITHUB_PATH
-    - name: Bootstrap
-      run: ./bootstrap.sh
-    - name: Configure
-      run: |
-        mkdir build
-        cd build
-        cmake ../ -DBUILD_DOC=on -DBUILD_TESTING=on
-    - name: Build
-      run: cd build && make -j 3
-    - name: Install
-      run: cd build && sudo make install
-    - name: Build tests
-      run: cd build && make tests -j 3
-    - name: Run tests
-      run: cd build && ctest --output-on-failure -j 3
-    - name: Run simple test
-      run: mod -e "smiles('O').print()"
   macOS-12:
     runs-on: macos-12
     steps: