RenovateBot: Update dependency cssnano to v5.1.15

This MR contains the following updates:

Package	Type	Update	Change
cssnano	dependencies	minor	5.0.16 -> 5.1.15

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Release Notes

cssnano/cssnano

v5.1.15: v5.1.15

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Bug Fixes

• fix(postcsss-reduce-initial): fix mask-repeat conversion
• fix(postcss-colormin): don't minify colors in src declarations
• fix(postcss-merge-rules): do not merge conflicting flex and border properties

v5.1.14: v5.1.14

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Bug Fixes

• fix: update autoprefixer and browserslist
• fix(postcss-reduce-initial): improve initial properties data

v5.1.13: v5.1.13

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Bug Fixes

• fix TypeScript type of cssnano() return value (https://github.com/cssnano/cssnano/commit/b92dbe3ab1db16141dc6296cd350f3fdf5c2defe)

v5.1.12: v5.1.12

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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: v5.1.11

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Bug Fixes

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

v5.1.10: v5.1.10

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Bug Fixes

• postcss-minify-selectors: preserve similar nested selectors (f6c29fb3e75ac26a2635d)

v5.1.9: v5.1.9

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Bug Fixes

• postcss-merge-longhand: preserve more color function fallbacks (712993cb4a4e0)

v5.1.8: v5.1.8

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Bug Fixes

• postcss-convert-values: preserve percentage sign on IE 11 (57f060ad21734)

v5.1.7

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v5.1.6: v5.1.6

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Bug Fixes

• preserve border color when merging border properties (5f5080a)

v5.1.5

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v5.1.4: v5.1.4

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Bug Fixes

• postcss-merge-longhand: preserve custom property case (5428d5fc9)

v5.1.3: v5.1.3

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Bug Fixes

• fix: do not merge declarations containing custom properties when it might create invalid declarations (2c699341)

v5.1.2: v5.1.2

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Bug fixes

• preserve empty custom properties and ensure they work in Chrome (4ed39679)

v5.1.1

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v5.1.0: v5.1.0

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New Feature

Add TypeScript types

v5.0.17: v5.0.17

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Patch Changes

• Publish untranspiled CommonJS source

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This MR has been generated by Renovate Bot.