modules: update OpenWrt packages

476b8b82b Merge pull request #15806 from blocktrron/pr-xr-usb-serial-1907
73c098477 xr_usb_serial_common: add PKG_MIRROR_HASH
7100f4006 xr_usb_serial_common: fix build
465ddb5b2 Merge pull request #15770 from DeathCamel58/libnet-1.2.x-libnet-config-fix
f7d4a6753 Merge pull request #15780 from stangri/19.07-https-dns-proxy
6ab17abde https-dns-proxy: update to 2021-06-03-1
bdbf33f69 libnet: Export `libnet-config` in development enviornments

Signed-off-by: David Bauer <mail@david-bauer.net>

modules

@@ -6,7 +6,7 @@ OPENWRT_COMMIT=ffd4452f8b241d1d5b5ea8a56206f51702bbd6c5
 
 PACKAGES_PACKAGES_REPO=https://github.com/openwrt/packages.git
 PACKAGES_PACKAGES_BRANCH=openwrt-19.07
-PACKAGES_PACKAGES_COMMIT=1c90bc08aeba8febd8f499ec9f1f91f6c41655d4
+PACKAGES_PACKAGES_COMMIT=476b8b82bb7447a1ed847c96d85de567e09cdb62
 
 PACKAGES_ROUTING_REPO=https://github.com/openwrt-routing/packages.git
 PACKAGES_ROUTING_BRANCH=openwrt-19.07