Update node-sass from 4.12.0 to 4.14.1

What does this MR do?

Updates node-sass from 4.12.0 to 4.14.1 to support Node.js 14.

Screenshots

n/a

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Style guides
• Separation of EE specific content

Availability and Testing

• [n/a] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [n/a] Tested in all supported browsers
• [n/a] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Closes #258963 (closed) #258964 (closed)