add use_annotations_as_alias_metadata field to auth_kubernetes_config

[c0deaddict]

Description

This PR adds the field use_annotations_as_alias_metadata to the vault_kubernetes_auth_backend_config resource. The field is missing in older versions of Vault (<1.16) so it's made optional in the code.

Closes #2224

Checklist

• [x] Added CHANGELOG entry (only for user-facing changes)
• [ ] Acceptance tests where run against all supported Vault Versions

^ I'm not sure how to run the acceptance tests locally, kind of hoping they run on CI?

I have tested the binary generated with make build locally against Vault 1.16.1.

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

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