Add missing targets for @debian_java_deps//:reactive_streams and @debian_java_deps//:rxjava3

Those targets should be added in https://github.com/bazelbuild/bazel/pull/13544, but that PR wasn't imported properly.

Fixes https://github.com/bazelbuild/bazel/issues/15103

RELNOTES: None
PiperOrigin-RevId: 436708706
diff --git a/tools/distributions/debian/debian_java.BUILD b/tools/distributions/debian/debian_java.BUILD
index bb7ad53..26906df 100644
--- a/tools/distributions/debian/debian_java.BUILD
+++ b/tools/distributions/debian/debian_java.BUILD
@@ -452,3 +452,17 @@
         "java/junit4.jar",
     ],
 )
+
+# libreactive-streams-java
+java_import(
+    name = "reactive_streams",
+    jars = ["reactive-streams.jar"],
+)
+
+# librx-java
+java_import(
+    name = "rxjava3",
+    jars = ["rxjava.jar"],
+    deps = [":reactive_streams"],
+)
+