mt76: update to the latest version

a666d5637bc3 mt76: fix tx status related use-after-free race on station removal

Signed-off-by: Felix Fietkau <[email protected]>

package/kernel/mt76/Makefile

@@ -8,9 +8,9 @@ PKG_LICENSE_FILES:=
 
 PKG_SOURCE_URL:=https://github.com/openwrt/mt76
 PKG_SOURCE_PROTO:=git
-PKG_SOURCE_DATE:=2022-04-20
-PKG_SOURCE_VERSION:=eecbb49920732b9b364f15c1ef0066342544b22b
-PKG_MIRROR_HASH:=1a5c171d1713baadd5ba7da3c036a129a0ac318e5b3f4e98f719e9a92a510c44
+PKG_SOURCE_DATE:=2022-04-23
+PKG_SOURCE_VERSION:=a666d5637bc3afd3e310be09fac048906560097b
+PKG_MIRROR_HASH:=1a7f7a36e5e376d1b18da98c7939f980855f1981be0c3ad7024360dee702c9f8
 
 PKG_MAINTAINER:=Felix Fietkau <[email protected]>
 PKG_USE_NINJA:=0