Prepare release v5.16.0 (palantir#4668)

Prepare release v5.15.0 (palantir#4621)

Prepare release v5.14.0 (palantir#4576)

Prepare release v5.13.1

Prepare release v5.13.0 (palantir#4538)

Merge pull request palantir#4454 from palantir/ad/prep-5.12.1

Prepare 5.12.1 release

Fix failing test (palantir#4392)

#### PR checklist

- [X] Addresses an existing issue: palantir#4391 

#### Overview of change:

Fix test that failed locally because it took too long. Not sure why this is only becoming an issue now - could be something that got added, but for now we may as well get 5.12 released and then figure it out.

Prepare release 5.11.0 (palantir#4042)

* Prepare release 5.11.0

* Fix changelog

Prepare release 5.10.0 (palantir#3871)

* Prepare release 5.10.0

Prepare release 5.9.1