community/R: specify explicit java version

This makes it possible for the build order resolver to find openjdk,
since the provides is only known after the package is built. This makes
it possible to bootstrap the aports repository.

This reverts commit 73482bd0 (community/R: use java-provides abstractions)

community/R/APKBUILD

@@ -3,7 +3,7 @@
 # Maintainer: Jakub Jirutka <jakub@jirutka.cz>
 pkgname=R
 pkgver=4.1.3
-pkgrel=0
+pkgrel=1
 pkgdesc="Language and environment for statistical computing"
 url="https://www.r-project.org/"
 # riscv64 blocked by java-jre-headless
@@ -29,7 +29,7 @@ depends_dev="
 makedepends="
 	$depends_dev
 	cairo-dev
-	java-jre-headless
+	openjdk8-jre-base
 	libxmu-dev
 	pango-dev
 	perl