chore(ci): Change runner from ubuntu-latest to ubuntu-slim

Try it out just for the static checks first.

Author: martyngigg

.github/workflows/ci-static.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   staticcheck:
     name: static checks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v3