build: remove deprecated compatibility_level from module()

The compatibility_level attribute in module() is a no-op and will be
removed in a future Bazel release.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Author: oharboe

MODULE.bazel

@@ -3,7 +3,6 @@
 module(
     name = "orfs",
     version = "0.0.1",
-    compatibility_level = 1,
 )
 
 bazel_dep(name = "bazel-orfs")