chore: pin ubuntu for Python 3.7 availability (#44)

Author: iisakkirotko

.github/workflows/installation.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   test-installation:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@v4