MAINTAINERS: mailmap: Update Stanislav's email address

Moving to personal address for upstream work.
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20240612225334.41869-1-sdf@google.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

.mailmap

@@ -606,6 +606,7 @@ Simon Kelley <simon@thekelleys.org.uk>
 Sricharan Ramabadhran <quic_srichara@quicinc.com> <sricharan@codeaurora.org>
 Srinivas Ramana <quic_sramana@quicinc.com> <sramana@codeaurora.org>
 Sriram R <quic_srirrama@quicinc.com> <srirrama@codeaurora.org>
+Stanislav Fomichev <sdf@fomichev.me> <sdf@google.com>
 Stefan Wahren <wahrenst@gmx.net> <stefan.wahren@i2se.com>
 Stéphane Witzmann <stephane.witzmann@ubpmes.univ-bpclermont.fr>
 Stephen Hemminger <stephen@networkplumber.org> <shemminger@linux-foundation.org>

MAINTAINERS

@@ -3980,7 +3980,7 @@ R:	Song Liu <song@kernel.org>
 R:	Yonghong Song <yonghong.song@linux.dev>
 R:	John Fastabend <john.fastabend@gmail.com>
 R:	KP Singh <kpsingh@kernel.org>
-R:	Stanislav Fomichev <sdf@google.com>
+R:	Stanislav Fomichev <sdf@fomichev.me>
 R:	Hao Luo <haoluo@google.com>
 R:	Jiri Olsa <jolsa@kernel.org>
 L:	bpf@vger.kernel.org