generate_refs.py: set custom user agent header

Avoids forbidden requests from kernel.org.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/
User-Agent

Signed-off-by: Daniel Gomez <[email protected]>

Author: dkruces

scripts/generate_refs.py

@@ -302,7 +302,9 @@ def kreleases(args) -> None:
 
     reflist = []
     if _check_connection("kernel.org", 80):
-        with urllib.request.urlopen("https://www.kernel.org/releases.json") as url:
+        _url = "https://www.kernel.org/releases.json"
+        req = urllib.request.Request(_url, headers={"User-Agent": "Mozilla/5.0"})
+        with urllib.request.urlopen(req) as url:
             data = json.load(url)
 
             for release in data["releases"]: