json lib module, syntax error

The json lib module seems to have an issue. That was not observed in 2018.

**To reproduce the error take:**
r = requests.get('https://aa.usno.navy.mil/api/rstt/oneday?date=2023-11-21 &coords=48.441832,9.890139 &tz=2').json()

**Generated error message:**
File "requests/__init__.py", line 33, in json
ValueError: syntax error in JSON

