gve: update MAINTAINERS

Jeroen is leaving Google and Josh is taking his place as a maintainer.

Signed-off-by: Jeroen de Borst <jeroendb@google.com>
Link: https://patch.msgid.link/20250903175649.23246-1-jeroendb@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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