identity/oidc: Adds section to 1.9 upgrade guide for ACL policy requirements #13154
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This PR adds a section to the 1.9 upgrade guide to call out the ACL policy requirements for the OIDC provider feature. Existing deployments of Vault that are upgraded to 1.9 will not have the required ACL rule that was added to the default policy (see policy_store.go#L154-L157) for 1.9.
This functions as designed and is not a new discovery. We wanted the Authorization Endpoint to be an authenticated endpoint. This guide is necessary because changes to the default policy are not applied during upgrades.