Use slim runners for some CI steps

Author: simolus3

.github/workflows/compile_sqlite.yml

@@ -15,7 +15,7 @@ on:
 
 jobs:
   download_sqlite:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     name: Download SQLite sources
     steps:
       - uses: actions/checkout@v6
@@ -325,7 +325,7 @@ jobs:
           path: sqlite3_connection_pool/out
 
   merge_assets:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     needs:
       - build_sqlite
       - compile_wasm