Fix CI matrix: use ubuntu-22.04 for Python 3.7

Author: Alienor134

.github/workflows/ci-cd.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-22.04, windows-latest, macos-latest]
         python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
         exclude:
           # Optional: exclude some combinations to speed up