CODEWONERS: Update for gpio_stm32 driver

Change codeowner following driver indeep rework.


Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

CODEOWNERS

@@ -133,7 +133,7 @@
 /drivers/flash/*stm32*                    @superna9999
 /drivers/gpio/                            @mnkp @pabigot
 /drivers/gpio/*ht16k33*                   @henrikbrixandersen
-/drivers/gpio/*stm32*                     @rsalveti @idlethread
+/drivers/gpio/*stm32*                     @erwango
 /drivers/gpio/*sx1509b*                   @pabigot
 /drivers/hwinfo/                          @alexanderwachter
 /drivers/i2s/i2s_ll_stm32*                @avisconti