ci.yml: Test on modern versions of GCC and CLang (#86, thanks @ cclauss)

* ci.yml: Test on modern versions of GCC and CLang
* sudo apt-get -qq update
* ci.yml: gcc-version: [9, 10, 12] clang-version: [11, 12, 14]

.github/workflows/ci.yml

@@ -17,15 +17,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [9, 10, 11]
+        version: [9, 10, 12]  # , 14]
 
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Install GCC ${{ matrix.version }}
-        run: sudo apt-get install -y gcc-${{ matrix.version }} g++-${{ matrix.version }}
+        run: |
+          sudo apt-get -qq update
+          sudo apt-get install -y gcc-${{ matrix.version }} g++-${{ matrix.version }}
 
       - name: Configure tests
         env:
@@ -47,15 +49,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [11, 12]
+        version: [11, 12, 14]  # , 16, 18]
 
     runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Install Clang ${{ matrix.version }}
-        run: sudo apt-get install -y clang-${{ matrix.version }}
+        run:  |
+          sudo apt-get -qq update
+          sudo apt-get install -y clang-${{ matrix.version }}
 
       - name: Configure tests
         env: