Use @rules_java in WORKSPACE

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 4a945c1..c820ee6 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -1,5 +1,5 @@
 workspace(name = "rules_java")
 
-load("//java:repositories.bzl", "rules_java_dependencies", "rules_java_toolchains")
+load("@rules_java//java:repositories.bzl", "rules_java_dependencies", "rules_java_toolchains")
 rules_java_dependencies()
 rules_java_toolchains()