ci.yml: Test on ubuntu-24.04 (#87, thanks @cclauss)

* ci.yml: Test on `ubuntu-24.04`
* CLang 11 and 12 must run on ubuntu-22.04
* runs-on: ${{ matrix.os }}

Author: cclauss

.github/workflows/ci.yml

@@ -17,9 +17,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [9, 10, 12]  # , 14]
+        version: [9, 10, 12, 14]
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
 
     steps:
       - uses: actions/checkout@v4
@@ -49,9 +49,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [11, 12, 14]  # , 16, 18]
+        os: [ubuntu-24.04]
+        version: [14, 16, 18]
+        include:
+          - os: ubuntu-22.04
+            version: 11
+          - os: ubuntu-22.04
+            version: 12
 
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
 
     steps:
       - uses: actions/checkout@v4