Pull request overview

This PR updates the JWT login test and slightly adjusts keypair generation to align with the latest MyPlex JWT implementation from #1577.

Changes:

• Update test_myplex_jwt_login to use a real MyPlexDevice, verify accounts via username instead of object equality, and strengthen coverage around multi-JWK verification and invalid-signature behavior.
• Refactor MyPlexJWTLogin.generateKeypair to write key bytes via local variables and then assign them to instance attributes, keeping behavior consistent while making the in-memory key handling clearer.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/test_myplex.py	Adjusts the JWT login test to create a dedicated MyPlexDevice, verify JWT-derived accounts via username, and more precisely exercise _getPlexPublicJWK behavior with valid and invalid JWKs.
plexapi/myplex.py	Updates MyPlexJWTLogin.generateKeypair to generate key bytes once, write them to files if requested, then assign them to _privateKey/_publicKey, preserving expected behavior and avoiding partially-updated instance state on FileExistsError.

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