DEVELOPERS: Update email address of Thomas Huth

Since tuxfamily.org is slowly fading away, update my mail address
to something that is more future-proof.

Signed-off-by: Thomas Huth <huth@tuxfamily.org>
Signed-off-by: Julien Olivain <ju.o@free.fr>

DEVELOPERS

@@ -3238,7 +3238,7 @@ N:	Thomas Devoogdt <thomas@devoogdt.com>
 F:	package/fluent-bit/
 F:	package/libsoup3/
 
-N:	Thomas Huth <huth@tuxfamily.org>
+N:	Thomas Huth <th.huth+br@posteo.eu>
 F:	package/ascii-invaders/
 F:	package/kvm-unit-tests/
 F:	package/xorcurses/