Update dependencies in SPA templates (#27219) (#28324)

Description
This PR updates the version of the caniuse-lite dependency to the latest version on our React and React/Redux SPA templates. The caniuse-lite dependency provides a database of browser features and their support across different browsers (as seen in caniuse.com). We were getting a warning because the dependency was out-of-date which meant that it was reporting compatibility info that was no longer accurate.

This PR also updates the version of node-sass to the latest version which no longer depends on the no-longer-supported Python 2.

Customer Impact
This bug was discovered during CTI validation.

This bug has a low severity because the user application can still run although JavaScript-based build tooling might report that the developer is leveraging browser features that aren't supported by the browser when they actually are.

Users can workaround this by running npx browserslist@latest --update-db inside their ClientApp directory. Users can also manually upgrade node-sass to v5 by editing their package.json file.

Regression?
No.

Risk
Low risk, because:

Change was validated manual
This fix applies the changes recommended by the browserlist library