tests: disable bzlmod for workspace-only pip_repository_annotations e…

…xample

The pip_repository_annoations example is workspace-only. Its equivalent
functionality is demonstrated in examples/bzlmod with the whl_mods
feature.

Work towards bazelbuild#1520

examples/pip_repository_annotations/.bazelrc

@@ -1,2 +1,6 @@
 # https://docs.bazel.build/versions/main/best-practices.html#using-the-bazelrc-file
 try-import %workspace%/user.bazelrc
+
+# This example is WORKSPACE specific. The equivalent functionality
+# is in examples/bzlmod as the `whl_mods` feature.
+build --experimental_enable_bzlmod=false