meta: Add explict branch to git SRC_URIs, handle github url changes

This update was made with the convert-scruri.py script in scripts/contrib

This script handles two emerging issues:

    1. There is uncertainty about the default branch name in git going forward.
    To try and cover the different possible outcomes, add branch names to all
    git:// and gitsm:// SRC_URI entries.

    2. Github are dropping support for git:// protocol fetching, so remap github
     urls as needed. For more details see:

    https://github.blog/2021-09-01-improving-git-protocol-security-github/

(From OE-Core rev: 827a805349f9732b2a5fa9184dc7922af36de327)

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/devupstream.bbclass

@@ -4,7 +4,7 @@
 #
 # Usage:
 # BBCLASSEXTEND = "devupstream:target"
-# SRC_URI_class-devupstream = "git://git.example.com/example"
+# SRC_URI_class-devupstream = "git://git.example.com/example;branch=master"
 # SRCREV_class-devupstream = "abcdef"
 #
 # If the first entry in SRC_URI is a git: URL then S is rewritten to