[kibana] Remove default OpenSSL legacy provider (#649)

Related to elastic/kibana#213123

This default configuration is being removed in 9.0+. For production,
preferably no changes should be made and this section is no longer
needed.

Co-authored-by: Edu González de la Herrán <[email protected]>

Author: jbudz

deploy-manage/production-guidance/kibana-in-production-environments.md

@@ -106,9 +106,3 @@ The option accepts a limit in MB:
 ```js
 --max-old-space-size=2048
 ```
-
-
-## OpenSSL Legacy Provider [openssl-legacy-provider] 
-
-Starting in 8.10.0, {{kib}} has upgraded its runtime environment, Node.js, from version 16 to version 18 and with it the underlying version of OpenSSL to version 3. Algorithms deemed legacy by OpenSSL 3 have been re-enabled to avoid potential breaking changes in a minor version release of {{kib}}. If SSL certificates configured for {{kib}} are not using any of the legacy algorithms mentioned in the [OpenSSL legacy provider documentation](https://www.openssl.org/docs/man3.0/man7/OSSL_PROVIDER-legacy.md), we recommend disabling this setting by removing `--openssl-legacy-provider` in the `node.options` config file.
-