[COMMITTERS] Update list of committers

Remove Canberk from the list committers. Thanks for all your
contributions!

Signed-off-by: Michael Munday <mike.munday@lowrisc.org>

COMMITTERS

diff --git a/COMMITTERS b/COMMITTERS
index a1c98d2..874ef5a 100644
--- a/COMMITTERS
+++ b/COMMITTERS
@@ -29,7 +29,6 @@
 * Dominic Rizzo (domrizz0)
 * Michael Schaffner (msfschaffner)
 * Rupert Swarbrick (rswarbrick)
-* Canberk Topal (ctopal)
 * Timothy Trippel (timothytrippel)
 * Alphan Ulusoy (alphan)
 * Pirmin Vogel (vogelpi)