Use ubuntu-slim runner (#191)

Signed-off-by: Yu Ishikawa <yu-iskw@users.noreply.github.com>

Author: yu-iskw

.github/workflows/test.yml

@@ -15,7 +15,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     strategy:
       matrix:
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]