testing/xmrig: upgrade to 6.12.0

Ref https://github.com/xmrig/xmrig/releases/tag/v6.12.0

testing/xmrig/APKBUILD

 # Contributor: Oleg Titov <oleg.titov@gmail.com>
 # Maintainer: Oleg Titov <oleg.titov@gmail.com>
 pkgname=xmrig
-pkgver=6.11.2
+pkgver=6.12.0
 pkgrel=0
 pkgdesc="XMRig is a high performance Monero (XMR) miner"
 url="https://xmrig.com/"
@@ -30,4 +30,4 @@ package() {
 	install -Dm 644 -t "$pkgdir"/usr/share/doc/$pkgname/ README.md
 }
 
-sha512sums="a374b8ac45d078f228dfd5c3cb2e6952b5a2c6ae3f77f1ba119c55e30db46f99b29cfc9305a2e1db611315be5f810ba4d746b8422abdfd19a7090adc5fb48169  xmrig-6.11.2.tar.gz"
+sha512sums="af6eaf8d4af451f6c5f1349cbc3922031a8069bb9d095fb171a98bae47b63f994f2d254a5a467f6589f6b1e2dc59bb6b582459a245ec67b1f62b9b4301805089  xmrig-6.12.0.tar.gz"