feat: add tailscale to simple-icons

[esoterick]

#8346

[adamrusted]

Thanks for the contribution @esoterick - and apologies that you have struggled with our linter!
Looking at the preview, I can see straight away that the icon will be failing because the path isn't 'centered'. Given this icon in it's raw form is a duotone one, we might be best to have the lower dots outlined instead of deleted, to still get the point across of the duotone without deleting them completely to please our linter 😅

Would you be up for having another look at this, or would you like me to put a path together?

[adamrusted]

@esoterick - are you still wanting to work on this? If not, could you please close down this PR so someone else can give it a go?

[service-paradis]

Closing this one for inactivity.