Set --enable_bzlmod=false for the moment

Until the newer nanobind tags are pushed to the BCR, it's best to disable
bzlmod for the bindings, because the Python CI breaks due to Bazel 7
enabling bzlmod by default.

setup.py

@@ -74,6 +74,7 @@ def bazel_build(self, ext: BazelExtension) -> None:
                 "bazel",
                 "build",
                 ext.bazel_target,
+                "--enable_bzlmod=false",
                 f"--symlink_prefix={temp_path / 'bazel-'}",
                 f"--compilation_mode={'dbg' if self.debug else 'opt'}",
                 # C++17 is required by nanobind