ci: use ubuntu-slim for simple jobs (#29)

Author: cesarcoatl

.github/workflows/autoupdate.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   autoupdate:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - name: Checkout repo
         uses: actions/checkout@v6

.github/workflows/buildrelease.yml

@@ -10,7 +10,7 @@ env:
 
 jobs:
   download:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - name: Download Python 3.12
         run: |
@@ -26,7 +26,7 @@ jobs:
 
   gh-release:
     needs: download
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6