Update init_params to initial_params

[sunxd3]

Ref: TuringLang/Turing.jl#2153

[yebai]

@sunxd3, can you update the environment file to allow the most recent releases of Turing?

[devmotion]

@sunxd3, can you update the environment file to allow the most recent releases of Turing?

I triggered a clean rerun of the UpdateManifests action for a more general update (which might require a few minor fixes in the tutorials though, given that the last update was a while ago): #434

[sunxd3]

@devmotion maybe merge this and then run the page buildings?

[devmotion]

Sure, my comment was not intended as a blocker for the PR, just an additional comment related to outdated environments.

[yebai]

Thanks @sunxd3 @devmotion!