That's a bug fix, not an improvement.
## 6.19.2 (November 11, 2022).
-IMPROVEMENTS:
+BUG FIX:
* resources/artifactory_keypair: add `passphrase` attribute to the JSON body. No API errors in Artifactory 7.41.13 and up. Issue: [#574](https://github.com/jfrog/terraform-provider-artifactory/issues/574)
PR: [#581](https://github.com/jfrog/terraform-provider-artifactory/pull/581)
