package/network-manager: fix CONTRIBUTING.md hash
The version bump in e3706f1 forgot to update the hash for
CONTRIBUTING.md
The file includes various changes unrelated to the legal information
(mailing list, how to build,...).
Fixes:
- http://autobuild.buildroot.net/results/bbd0db06663b6df82973173bb044b57f013e844b
Signed-off-by: Daniel Lang <d.lang@abatec.at>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Lang Daniel