ci.yml: Fix gcc/g++ versions to be the default.

Also
- Add python 3.11 and 3.12.
- Rename python 3.10-dev to 3.10.
- Cleanup whitespace.

.github/workflows/ci.yml

@@ -19,32 +19,39 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10-dev']
+	python-version: [
+	  '3.7',
+	  '3.8',
+	  '3.9',
+	  '3.10',
+	  '3.11',
+	  '3.12',
+	]
     steps:
       - name: Add required sources and pkgs
-        run: |
-          sudo add-apt-repository --update --yes 'deb http://archive.ubuntu.com/ubuntu/ bionic main universe'
-          sudo apt-get install gcc-6 g++-6
+	run: |
+	  sudo add-apt-repository --update --yes 'deb http://archive.ubuntu.com/ubuntu/ bionic main universe'
+	  sudo apt-get install gcc g++
 
       - name: Checkout repo
-        uses: actions/checkout@v2
+	uses: actions/checkout@v2
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
-        with:
-          python-version: ${{ matrix.python-version }}
-          architecture: 'x64'
+	uses: actions/setup-python@v2
+	with:
+	  python-version: ${{ matrix.python-version }}
+	  architecture: 'x64'
 
       - name: Before install
-        run: |
-          mkdir --parents --verbose ${{ env.PIP_WHEEL_DIR }}
-          pip install setuptools --upgrade
-          pip install pytest --upgrade
+	run: |
+	  mkdir --parents --verbose ${{ env.PIP_WHEEL_DIR }}
+	  pip install setuptools --upgrade
+	  pip install pytest --upgrade
 
       - name: Install
-        run: CC=g++-6 pip install .\[tests\] --upgrade
-        
+	run: CC=g++-6 pip install .\[tests\] --upgrade
+
       - name: Script
-        run: |
-          (cd src && CC=gcc-6 CXX=g++-6 make -f Makefile-custom -j 4 test)
-          py.test ais test --cov=ais --cov-report term-missing
+	run: |
+	  (cd src && CC=gcc CXX=g++ make -f Makefile-custom -j 4 test)
+	  py.test ais test --cov=ais --cov-report term-missing