Make `java_stub_template.txt` visible to Bazel tests

PiperOrigin-RevId: 716217901
Change-Id: I8c571d43c9dcfbcb219f8bbe69ab472887a75001

java/bazel/rules/BUILD.bazel

diff --git a/java/bazel/rules/BUILD.bazel b/java/bazel/rules/BUILD.bazel
index 0ffa9d4..65d0637 100644
--- a/java/bazel/rules/BUILD.bazel
+++ b/java/bazel/rules/BUILD.bazel
@@ -39,6 +39,7 @@
     testonly = 1,
     srcs = [
         "BUILD.bazel",
+        ":java_stub_template.txt",
         ":rules",
     ],
     visibility = ["//java:__pkg__"],