Merge branch 'net-replace-sock_i_uid-with-sk_uid'

Eric Dumazet says:

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net: replace sock_i_uid() with sk_uid()

First patch annotates sk->sk_uid accesses and adds sk_uid() helper.

Second patch removes sock_i_uid() in favor of the new helper.
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Link: https://patch.msgid.link/20250620133001.4090592-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>