python3-dbusmock: upgrade 0.37.2 -> 0.38.1

python3-dbusmock: upgrade 0.37.2 -> 0.38.1

Changelog:
=============
- polkitd: Add RegisterAuthenticationAgentWithOptions
- logind: Add SetWallMessage
- README: Update outdated and broken examples, move to addCleanup()
- Move all license comments to SPDX-License-Identifier
- tests: Skip test_readme_examples if README.md is not present

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>