Deps: Use sass-loader v13

[tyxla]

Proposed Changes

Consistently use sass-loader@13 instead of 3 different versions.

Why are these changes being made?

During the latest WordPress monorepo upgrade (#96470) I noticed this inconsistency and thought it might make sense to be fixed.

Testing Instructions

• Build should work well and all checks should be green.
• Do some smoke testing and verify things work well.

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-133103

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-133103&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-133103&env=a8c-for-agencies

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• help-center
• notifications
• odyssey-stats
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug update/sass-loader-13 on your sandbox.

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.