Migrate from Newtonsoft.Json to System.Text.Json

[Christian-Oleson]

User story

As a user, I would like to depend as little on third-party dependencies as possible. For this reason, I would like to move from Newtonsoft.Json to System.Text.Json.

Proposed solution

Replace Newtonsoft.Json with System.Text.Json

Alternatives considered

N/a

Additional information

I believe that this issue (#515) would not be present if we were referencing System.Text.Json. Likewise, I've had a hard time with that particular issue in the code. Something about Newtonsoft with the Okta client is giving me a ton of problems, even after downgrading, making me think we would be better migrating off of it.

[bryanapellanes-okta]

@Christian-Oleson,
Thanks for reaching out! We will review your request internally and reply here.

[rcollette]

Seriously, System.Text.Json has been out for years. Newtonsoft is not compatible with JSON serialization source generators.