chore(deps): update dependency cssnano to v5.1.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cssnano	5.1.14 -> 5.1.15

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Release Notes

cssnano/cssnano

v5.1.15: v5.1.15

Compare Source

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

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Configuration

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[codecov]

Codecov Report

Base: 95.40% // Head: 95.40% // No change to project coverage 👍

Coverage data is based on head (2e1ffb8) compared to base (117cbc5).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1847   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files          18       18           
  Lines        1457     1457           
=======================================
  Hits         1390     1390           
  Misses         67       67           

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