codeowners: Update memfault sample

Add codeowners entry for samples/debug/memfault

Signed-off-by: Jorgen Kvalvaag <jorgen.kvalvaag@nordicsemi.no>

Author: jorgenmk

CODEOWNERS

@@ -149,6 +149,7 @@ Kconfig*                                  @tejlmand
 /samples/bootloader/                      @hakonfam @oyvindronningstad
 /samples/matter/                          @Damian-Nordic @kkasperczyk-no
 /samples/crypto/                          @frkv @Vge0rge @vili-nordic @joerchan @SebastianBoe @mswarowsky
+/samples/debug/memfault/                  @nrfconnect/ncs-cia
 /samples/debug/ppi_trace/                 @nordic-krch @anangl
 /samples/hw_id/                           @nrfconnect/ncs-cia
 /samples/edge_impulse/                    @pdunaj