Set minimum System.Text.Json version to 5.0.1

[LauraArmitage]

Description

Fix #1899

[alexeyzimarev]

Thanks for the fix. One question: why have you removed the open upper version constraint?

[LauraArmitage]

Sorry, I've not done this right - I was just trying to merge this into my fork. I've not tested this yet
From this doc I interpret that [5.0,) sets an inclusive minimum only and this would be the same but with a higher minimum version.

[alexeyzimarev]

I think it could be [5.0.1,)

[alexeyzimarev]

Could also be (5.0,). Yes, I think your current implementation is correct, I didn't read the docs correctly.

[LauraArmitage]

Thanks, I'll mark this as ready for review once I've tested