Fixes tests for httpx 0.23.2

[desertaxle]

httpx started throwing errors in 0.23.2 for UUIDs passed into params. This PR fixes tests that started failing due to that change.

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[zanieb]

See encode/httpx#2523 for the cause.

Should we release a version of Prefect without this fix that adds an HTTPX upper bound then release another with the fix (with the upper bound removed) so our users are less likely to encounter version compatibility errors? It might not be worth it on our release cadence.