missing return statements

Problem/Motivation

Scanning this module with Upgrade Status results in,

Method Drupal\paragraphs_library\Form\LibraryItemForm::save() should return int but return statement is missing.
Method Drupal\paragraphs\Form\ParagraphsTypeForm::save() should return int but return statement is missing.

Steps to reproduce

Use Upgrade Status to scan the module in Drupal 11.

Proposed resolution

Add return statements to the methods.