github-workflows: replace scrapy 2.6 with 2.9, support for 2 most recent scrapy versions

Author: pawelmhm

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11"]
-        scrapy-version: ["2.10", "2.6"]
+        scrapy-version: ["2.10", "2.9"]
 
     steps:
     - uses: actions/checkout@v2