Bump cssnano from 5.1.10 to 5.1.12 in /client

[dependabot[bot]]

Bumps cssnano from 5.1.10 to 5.1.12.

Release notes

Sourced from cssnano's releases.

v5.1.12

Bug Fixes

• fix: preserve hyphenated property case (https://github.com/cssnano/cssnano/commit/120a88899376a29c8756234fdc648c519921f515)
• fix: ensure sorting properties does not break the output (https://github.com/cssnano/cssnano/commit/0a3a1331e29f3d1009d2a938181ffa4b34ab5b32)
• fix: recognize 'constant' as a function (https://github.com/cssnano/cssnano/commit/858a8b77c951f3698b14e834f38128b176438edc)

v5.1.11

Bug Fixes

• postcss-ordered-values: preserve constant values (32ab4d9b7d20d)

Commits

• 4a8f54a Publish cssnano 5.1.12
• 0a3a133 fix(cssnano-preset-default): update css-declaration-sorter
• 120a888 fix(postcss-merge-longhand): preserve hyphenated custom property case
• 858a8b7 refactor: use the same variable functions definition everywhere
• e707fc2 refactor(postcss-ordered-values): extract variable functions set
• 541f552 docs: fix accessibility issues that Axe found
• a02a893 docs: update website dependencies.
• b1d5226 Publish cssnano 5.1.11 (#1412)
• 32ab4d9 fix(postcss-ordered-values): preserve constant values (#1411)
• ffa084e test: separate integration tests from single plugin tests (#1409)
• Additional commits viewable in compare view

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