device-purism-librem5: remove craftyguy as maintainer (MR 5223)

I'm not able to give this device the attention it deserves.

This also removes me from maintaining fw and kernel packages used by the
L5, and adds the current L5 maintainers to those packages.

[ci:skip-vercheck]
[ci:skip-build]: already built successfully in CI

device/main/device-purism-librem5/APKBUILD

 # Reference: <https://postmarketos.org/devicepkg>
-# Maintainer: Clayton Craft <clayton@craftyguy.net>
-# Co-Maintainer: Alistair Francis <alistair@alistair23.me>
+# Maintainer: Alistair Francis <alistair@alistair23.me>
 # Co-Maintainer: Newbyte <newbyte@postmarketos.org>
+# Contributor: Clayton Craft <clayton@craftyguy.net>
 pkgname=device-purism-librem5
 pkgver=3
 pkgrel=0

device/main/firmware-brcm43752/APKBUILD

-# Maintainer: Clayton Craft <clayton@craftyguy.net>
+# Maintainer: Alistair Francis <alistair@alistair23.me>
+# Co-Maintainer: Newbyte <newbyte@postmarketos.org>
+# Contributor: Clayton Craft <clayton@craftyguy.net>
 pkgname=firmware-brcm43752
 pkgver=3_git20230613
 pkgrel=1

device/main/firmware-siliconlabs-rs9116/APKBUILD

-# Maintainer: Clayton Craft <clayton@craftyguy.net>
+# Maintainer: Alistair Francis <alistair@alistair23.me>
+# Co-Maintainer: Newbyte <newbyte@postmarketos.org>
+# Contributor: Clayton Craft <clayton@craftyguy.net>
 pkgname=firmware-siliconlabs-rs9116
 pkgver=2.5.1
 pkgrel=0

device/main/linux-purism-librem5/APKBUILD

 # Reference: <https://postmarketos.org/vendorkernel>
-# Maintainer: Clayton Craft <clayton@craftyguy.net>
-# Co-Maintainer: Alistair Francis <alistair@alistair23.me>
+# Maintainer: Alistair Francis <alistair@alistair23.me>
 # Co-Maintainer: Newbyte <newbyte@postmarketos.org>
+# Contributor: Clayton Craft <clayton@craftyguy.net>
 pkgname=linux-purism-librem5
 pkgver=6.6.32
 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: Alistair Francis <alistair@alistair23.me>
+# Maintainer: Alistair Francis <alistair@alistair23.me>
 # Co-Maintainer: Newbyte <newbyte@postmarketos.org>
+# Contributor: Clayton Craft <clayton@craftyguy.net>
 pkgname=u-boot-librem5
 pkgver=2022.10
 pkgrel=2