github-workflows: remove 3.12 python

Author: pawelmhm

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
         scrapy-version: ["2.10", "2.6"]
 
     steps: