Object Store Doctest Failure with Default Features

[tustvold]

Describe the bug

Running cargo test on the object_store crate result in a failing doctest

---- src/lib.rs - (line 105) stdout ----
error[E0432]: unresolved import `object_store::aws`
 --> src/lib.rs:109:19
  |
7 | use object_store::aws::{AmazonS3, AmazonS3Builder};
  |                   ^^^ could not find `aws` in `object_store`

This was introduced in #4978 and not caught by CI as we only test with all features

To Reproduce

Expected behavior

Additional context

#5024 worked around this for the purposes of release verification, and is also generally a more correct for the verification scripts to be doing.

[tustvold]

label_issue.py automatically added labels {'object-store'} from #5161