You have recently renewed your key.p.12 certificate and want to know if you also need a new plugin license (pluginlicense.js).
You don't need a new plugin license after renewing your key.p12.
However, to verify the validity of a Plugin License, navigate to Platform Configuration > Server Configuration Check in the SupportAdministrator portal and click on Run Checks.
If the Signing Certificate is shown to be invalid, the Plugin License may have expired and a new one will have to be provided.
Our article Generating Plug-in License provides steps to generate a new plug-in license.