release: v0.2.6 with improved config validation & token exchange error handling

[rhamzeh]

Description

• feat(validation): ensure storeId and authorizationModelId are in valid ulid format
• fix(client): ensure that the api connection is valid
• fix(credentials): retry on client credential exchange in case of errors
• chore(deps): update dependencies

References

• Closes The JSDoc documentation for ListRelations is incorrect #15
• Addresses the JS SDK part of:
  • [All SDKs] Better handling of errors during Client Credentials flow sdk-generator#112
  • [All SDKs] Validate that the Store ID and Authorization Model ID are valid ULIDs sdk-generator#114
  • [All SDKs] ListRelations, BatchCheck & non-txn Write should attempt to refresh the token before proceeding sdk-generator#115

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected