community/obs-studio: add missing dependency

With recent versions of Qt, package fails to build without this
dependency.

Fixes: alpine/aports#16903

community/obs-studio/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Francesco Colista <fcolista@alpinelinux.org>
 pkgname=obs-studio
 pkgver=30.2.3
-pkgrel=0
+pkgrel=1
 pkgdesc="Free and open source software for live streaming and screen recording"
 url="https://obsproject.com/"
 arch="all !ppc64le !riscv64" # luajit
@@ -41,6 +41,7 @@ makedepends="
 	python3-dev
 	py3-glad
 	qt6-qtbase-dev
+	qt6-qtbase-private-dev
 	qt6-qtsvg-dev
 	samurai
 	sed