refactor(multiple): fix warnings related to division operator in latest version of Sass

[crisbeto]

The latest version of Sass prints a warning when the division operator is used. These changes migrate us to the recommended math.div function.

Note: there a few warnings left from MDC. I've submitted material-components/material-components-web#7158 to address them.

More information: https://sass-lang.com/documentation/breaking-changes/slash-div

Fixes #22866.

[devversion]

LGTM, one minor nit from my side.

[crisbeto]

@jelbourn one thing we may want to consider here: the math.div function is available from Sass version 1.33.0 onwards whereas the CLI currently installs 1.32.12. Should we ask the CLI to update or delay this to a future version? Users that have updated Sass on their own will get a ton of warnings like in #22866 though. Alternatively, I can add our own helper for division that can be used to polyfill math.div.

[crisbeto]

I've reworked the changes to make them backwards-compatible with Sass less than 1.34.0.

[jelbourn]

LGTM

[fredericojesus]

How do I know when this is going to be released ? Thanks in advance.

[crisbeto]

It'll be released in version 12.1.

[crhistianramirez]

I am seeing it in 12.0.6 but not in any of the newer versions like 12.1.1 for example. Is this expected?

[crisbeto]

That sounds weird since we only merged it into the 12.1.0 branch.

[crhistianramirez]

Never mind! My mistake 😅

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