Drop `compatibility_level` from `rules_java`

Deprecated and no-op in all Bazel versions.

PiperOrigin-RevId: 991583335
Change-Id: Id40bb1853ab9f4fdd30bfcda28c7a7b5d6b8ad19

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
index b11bd66..556f7c5 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -2,7 +2,6 @@
     name = "rules_java",
     version = "0.0.0",
     bazel_compatibility = [">=7.0.0"],
-    compatibility_level = 1,
 )
 
 bazel_dep(name = "platforms", version = "0.0.11")