fix prefect dep

Merge pull request #954 from SpaceShaman/patch-1

Update audio.py

Merge pull request #948 from PrefectHQ/datetime

fix datetime method call

Merge pull request #939 from andehr/thread-images

add image files to thread via add method (supports Assistant API vision)

Merge pull request #923 from PrefectHQ/fix-maze

fix maze

Merge pull request #919 from PrefectHQ/extra-return

Extra return

Merge pull request #917 from PrefectHQ/logfire

add logfire example

Merge pull request #881 from PrefectHQ/instructions

Allow assistant instructions to be jinja and self-referential

Merge pull request #874 from PrefectHQ/cli

Update CLI

Merge pull request #872 from PrefectHQ/tools

Tool → FunctionTool