Remove `java_runtime` override

No longer necessary after https://github.com/bazelbuild/rules_java/commit/899c55129a9e087f01c4485158958573c6e329cd which made it the default.

(ignore-relnotes)

PiperOrigin-RevId: 948202174
Change-Id: I87341f71f3f109f94d57533a29886eaed2a6407b

toolchains/BUILD

diff --git a/toolchains/BUILD b/toolchains/BUILD
index 30b78e5..2579555 100644
--- a/toolchains/BUILD
+++ b/toolchains/BUILD
@@ -366,7 +366,7 @@
 [
     default_java_toolchain(
         name = ("toolchain_java%d" if release <= 11 else "toolchain_jdk_%d") % release,
-        configuration = DEFAULT_TOOLCHAIN_CONFIGURATION | {"java_runtime": ":remotejdk_25"},
+        configuration = DEFAULT_TOOLCHAIN_CONFIGURATION,
         source_version = "%s" % release,
         target_version = "%s" % release,
     )