Fix: Rollback core-js@3.6.4 to core-js@3.5.0

[neenhouse]

Description

core-js@3.6.0 introduces a sticky polyfill that causes an infinite loop for IE11 users. (see zloirock/core-js#754 (comment))

Motivation and Context

The core-js polyfill for sticky regex causes an infinite loop when being parsed by IE11. See zloirock/core-js#754 and https://github.com/slevithan/xregexp/blob/2cb340a819b290c2d8638965fb7e825cfc0efbc4/src/xregexp.js#L604

How Has This Been Tested?

Tested / verified in integrated web applications offline (@underbyte)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[neenhouse]

Reference: zloirock/core-js#754