[tracking] Dependency cleanup

[rcoh]

• aws-hyper should have test-util be an off-by-default feature
• unnecessary serde/serde_derive dependency on XML services where this is unused Remove unnecessary serde/serde_derive dependency from XML services #931
• CI job to run cargo tree -d (check for duplicate versions in tree)
• CI job to run cargo udeps
• change pin_project to pin_project_lite (removes syn / proc macro dependency) Change pin_project to pin_project_lite #932

[jdisanti]

Tracking the CI pieces in #929

[jdisanti]

Planning to remove aws-hyper. Closing this since it's not tracking anything anymore.