recipes: Update github.com urls to use https

Github has announced there will be no more git:// fetching from their servers:

https://github.blog/2021-09-01-improving-git-protocol-security-github/#no-more-unauthenticated-git



and they're about to start having brownout periods to encourage people
to update. This runs the conversion script over OE-Core to update our
urls to use https instead of git.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>