Add job using GCC 7

Author: rwgk

.github/workflows/ci.yml

@@ -67,7 +67,9 @@ jobs:
           # Extra ubuntu latest job
           - runs-on: ubuntu-latest
             python: '3.11'
-
+          # For GCC 7
+          - runs-on: ubuntu-18.04
+            python: '3.8'
 
     name: "🐍 ${{ matrix.python }} • ${{ matrix.runs-on }} • x64 ${{ matrix.args }}"
     runs-on: ${{ matrix.runs-on }}