*-purism-librem5: remove Bhushan as co-maintainer (MR 3705) (MR 3900)

He is not actively maintaining this device in pmOS

(cherry picked from commit 280605a1)

device/main/device-purism-librem5/APKBUILD

 # Reference: <https://postmarketos.org/devicepkg>
 # Maintainer:  Clayton Craft <clayton@craftyguy.net>
-# Co-Maintainer: Bhushan Shah <bshah@kde.org>
 pkgname=device-purism-librem5
 pkgdesc="Purism Librem 5 Phone"
 pkgver=1.37

device/main/linux-purism-librem5/APKBUILD

 # Reference: <https://postmarketos.org/vendorkernel>
 # Maintainer:  Clayton Craft <clayton@craftyguy.net>
-# Co-Maintainer: Bhushan Shah <bshah@kde.org>
 pkgname=linux-purism-librem5
 pkgver=6.1.1
 pkgrel=0

device/main/u-boot-librem5/APKBUILD

 # Mainline u-boot with Librem 5 support and config
 # Maintainer: Clayton Craft <clayton@craftyguy.net>
-# Co-Maintainer: Bhushan Shah <bshah@kde.org>
 pkgname=u-boot-librem5
 pkgver=2022.04_git20220420
 pkgrel=1