`version_repo` is not updated when Bazel version changes

When switching the Bazel version, the `bazel_features_version` repo generated by https://github.com/bazel-contrib/bazel_features/blob/1f1b95a6fcdc5bfcc67f7a845f3f5e8e89cc7d29/private/version_repo.bzl#L5-L5 won't be automatically updated, which could result wrong feature detection result.