PEP 695 is not tested to be `pickle`able

[sobolevn]

(or at least I cannot find these tests)

I think that testing the pickle result of functions, classes, and type aliases created with the new syntax is very important.

I propose to add these tests, PR is in the works.

Linked PRs

• gh-105433: Add pickle tests for PEP695 #105443
• [3.12] gh-105433: Add pickle tests for PEP695 (GH-105443) #105845

[sunmy2019]

Sounds reasonable.

[JelleZijlstra]

Thanks Nikita!