Remove rules_java from MODULE.bazel

This follows up to our previous commit [1], which introduced the
dependency on 'rules_java' as an attempt to support Android build with
bzlmod (google#1002).

Luckily a subsequent commit [2] had effectively removed the the
dependency on 'rules_java', but 'MODULE.bazel' had not been reflected.
Let's also update 'MODULE.bazel' for simplicity and maintainability.

There must be no difference in the final artifacts.

 [1]: 699c2ce
 [2]: 6c61c4f

src/MODULE.bazel

@@ -65,13 +65,6 @@ bazel_dep(
     repo_name = "build_bazel_apple_support",
 )
 
-# Java rules (7.9.0 2024-08-13)
-# https://github.com/bazelbuild/rules_java
-bazel_dep(
-    name = "rules_java",
-    version = "7.9.0",
-)
-
 # Android NDK rules (0.1.2 2024-07-23)
 # https://github.com/bazelbuild/rules_android_ndk
 bazel_dep(