MAINTAINERS: Remove myself from TC maintainers

Recently TC maintainer Jamal intentionally a broke reasonable
use case:
https://lore.kernel.org/netdev/aG10rqwjX6elG1Gx@pop-os.localdomain/

Although I tried my best to help by:
1) Strongly objecting this breakage from the very beginning
2) Reverting it and offering a much better solution
3) Offering Jamal for video chat on 8 Jul 2025 and 26 Nov 2025

None of them worked.

So it makes no sense for me to continue caring about this subsystem.

Most importantly, intentionally breaking reasonable use cases is
against my moral, I don't want to get ashamed.

Thanks for the opportunity!

Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Link: https://patch.msgid.link/20260130212021.46610-1-xiyou.wangcong@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>