fix keyring bug

[jaylonmcshan19-x]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

This pr Fixes the "Provider produced invalid plan" error that occurs when upgrading from provider v2.x to v3.x with keyring attribute set to empty string or null.

the pr normalizes empty string keyring values to null during state migration
from v2 to v3 to match user configurations.

Acceptance tests

• Have you added an acceptance test for the functionality being added?

Release Note

Release note for CHANGELOG:

...

References

#1695

Community Note

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[kimxogus]

This fix is critical to my case. Hope to be released asap 👍

[phyzical]

worth noting all this pr does is forces a default value of keyring = "" so simply add that to keep getting on with your day