Posthog cannot send data due to proxy

Telemetry does not work if a proxy is in place, ideally it would use the proxy setting in the Addon Manager preferences.

This warning pops up on every start of FreeCAD:

```
07:47:11 WARNING:urllib3.connectionpool:Retrying (Retry(total=1, connect=1, read=2, redirect=None, status=None)) after connection broken by 'NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")': /batch/
07:47:11 WARNING:urllib3.connectionpool:Retrying (Retry(total=0, connect=0, read=2, redirect=None, status=None)) after connection broken by 'NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")': /batch/
07:47:11 INFO:backoff:Backing off send_request(...) for 0.4s (requests.exceptions.ConnectionError: HTTPSConnectionPool(host='eu.i.posthog.com', port=443): Max retries exceeded with url: /batch/ (Caused by NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")))
07:47:11 WARNING:urllib3.connectionpool:Retrying (Retry(total=1, connect=1, read=2, redirect=None, status=None)) after connection broken by 'NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")': /batch/
07:47:11 WARNING:urllib3.connectionpool:Retrying (Retry(total=0, connect=0, read=2, redirect=None, status=None)) after connection broken by 'NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")': /batch/
07:47:11 INFO:backoff:Backing off send_request(...) for 1.4s (requests.exceptions.ConnectionError: HTTPSConnectionPool(host='eu.i.posthog.com', port=443): Max retries exceeded with url: /batch/ (Caused by NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")))
07:47:11 WARNING:urllib3.connectionpool:Retrying (Retry(total=1, connect=1, read=2, redirect=None, status=None)) after connection broken by 'NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")': /batch/
07:47:11 WARNING:urllib3.connectionpool:Retrying (Retry(total=0, connect=0, read=2, redirect=None, status=None)) after connection broken by 'NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")': /batch/
07:47:11 INFO:backoff:Backing off send_request(...) for 0.7s (requests.exceptions.ConnectionError: HTTPSConnectionPool(host='eu.i.posthog.com', port=443): Max retries exceeded with url: /batch/ (Caused by NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")))
07:47:11 WARNING:urllib3.connectionpool:Retrying (Retry(total=1, connect=1, read=2, redirect=None, status=None)) after connection broken by 'NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")': /batch/
07:47:11 WARNING:urllib3.connectionpool:Retrying (Retry(total=0, connect=0, read=2, redirect=None, status=None)) after connection broken by 'NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")': /batch/
07:47:11 ERROR:backoff:Giving up send_request(...) after 4 tries (requests.exceptions.ConnectionError: HTTPSConnectionPool(host='eu.i.posthog.com', port=443): Max retries exceeded with url: /batch/ (Caused by NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)")))
07:47:11 ERROR:posthog:error uploading: HTTPSConnectionPool(host='eu.i.posthog.com', port=443): Max retries exceeded with url: /batch/ (Caused by NameResolutionError(": Failed to resolve 'eu.i.posthog.com' ([Errno 11001] getaddrinfo failed)"))
07:47:11 Telemetry Addon: Error connecting, no telemetry will be sent for this session
```