Upgrade test for deprecated LibSass to node-sass@5

[romaricpascal]

This is the first version that can be installed on Github Actions runner without failing thanks to it introducing support for Python 3.

https://github.com/sass/node-sass/releases/tag/v5.0.0

[domoscargin]

🤞

[github-actions]

📋 Stats

File sizes

File	Size
dist/govuk-frontend-development.min.css	118.41 KiB
dist/govuk-frontend-development.min.js	42.78 KiB
packages/govuk-frontend/dist/govuk/all.bundle.js	92.92 KiB
packages/govuk-frontend/dist/govuk/all.bundle.mjs	87.29 KiB
packages/govuk-frontend/dist/govuk/all.mjs	1.18 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend-component.mjs	1.74 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend.min.css	118.4 KiB
packages/govuk-frontend/dist/govuk/govuk-frontend.min.js	42.77 KiB
packages/govuk-frontend/dist/govuk/i18n.mjs	5.55 KiB
packages/govuk-frontend/dist/govuk/init.mjs	7.13 KiB

Modules

File	Size (bundled)	Size (minified)
all.mjs	82.76 KiB	40.37 KiB
accordion.mjs	26.62 KiB	13.41 KiB
button.mjs	9.13 KiB	3.78 KiB
character-count.mjs	25.43 KiB	10.9 KiB
checkboxes.mjs	7.81 KiB	3.42 KiB
error-summary.mjs	11.03 KiB	4.54 KiB
exit-this-page.mjs	20.24 KiB	10.34 KiB
header.mjs	6.46 KiB	3.22 KiB
notification-banner.mjs	9.39 KiB	3.7 KiB
password-input.mjs	18.28 KiB	8.33 KiB
radios.mjs	6.81 KiB	2.98 KiB
service-navigation.mjs	6.44 KiB	3.26 KiB
skip-link.mjs	6.4 KiB	2.76 KiB
tabs.mjs	12.04 KiB	6.67 KiB

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Action run for 04b90a4