Add checkout step to chores workflow

Adds a repository checkout step in the chores CI workflow to ensure code
is available for subsequent chore automation tasks. This update enables
the proper execution of the automated script for generating chores
issues.

.forgejo/workflows/chores.yml

@@ -5,5 +5,7 @@ on: [push]
 jobs:
   chores:
     steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
       - name: Create Chores Issue
         run: python3 scripts/chores.py