Refactor HTTP common code (#207)

- move to common/http.py,
- make fetch_url return a Response.

src/typo3.py

@@ -1,4 +1,5 @@
 import json
+from common import http
 from common import endoflife
 
 PRODUCT = "typo3"
@@ -7,8 +8,8 @@ URL = "https://get.typo3.org/api/v1/release/"
 print(f"::group::{PRODUCT}")
 versions = {}
 
-response = endoflife.fetch_url(URL)
-data = json.loads(response)
+response = http.fetch_url(URL)
+data = json.loads(response.text)
 for v in data:
     if v['type'] != 'development':
         date = v["date"][0:10]