pine64-pinephone: Remove myself as maintainer (MR 3804)

I have enough other devices to care about, and honestly haven't touched
my PinePhone in a while. Remove myself as Co-Maintainer from all
relevant packages.

[ci:skip-vercheck]: No rebuild necessary
[ci:skip-build]: Doesn't change resulting packages

device/main/device-pine64-pinephone/APKBUILD

 # Reference: <https://postmarketos.org/devicepkg>
 # Maintainer: Martijn Braam <martijn@brixit.nl>
 # Co-Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
-# Co-Maintainer: Luca Weiss <luca@z3ntu.xyz>
 # Co-Maintainer: Dylan Van Assche <me@dylanvanassche.be>
 pkgname=device-pine64-pinephone
 pkgver=0.44

device/main/firmware-pine64-rtl8723bt/APKBUILD

 # Maintainer: Martijn Braam <martijn@brixit.nl>
-# Co-Maintainer: Luca Weiss <luca@z3ntu.xyz>
 # Co-Maintainer: Bart Ribbers <bribbers@disroot.org>
 pkgname=firmware-pine64-rtl8723bt
 pkgver=0_git20200705

device/main/linux-postmarketos-allwinner/APKBUILD

 # Maintainer: Martijn Braam <martijn@brixit.nl>
-# Co-Maintainer: Luca Weiss <luca@z3ntu.xyz>
 # Co-Maintainer: Bart Ribbers <bribbers@disroot.org>
 # Co-Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
 # Co-Maintainer: Clayton Craft <clayton@craftyguy.net>

device/main/u-boot-pinephone/APKBUILD

 # Maintainer: Martijn Braam <martijn@brixit.nl>
-# Co-Maintainer: Luca Weiss <luca@z3ntu.xyz>
 # Co-Maintainer: Bart Ribbers <bribbers@disroot.org>
 # Co-Maintainer: Clayton Craft <clayton@craftyguy.net>
 # Co-Maintainer: Dylan Van Assche <me@dylanvanassche.be>