Hey There!
Was having this issue myself for the last few days without rhyme or reason, and created an account SPECIFICALLY to address this issue.
It looks like the browser extension "uBlock Origin" is the culprit here.
This post is how I figured it out:
The LATVIAN LIST that uBlock uses for international blocking is hosted at notabug.org - hence everytime it attemps to update, an outbound connection is created over port 443 and it tries to connect back to that Git service.
Turn off the list if you are using it, or remove the extension all together if you don't feel comfortable.
Best of luck