Bump color-string from 1.5.4 to 1.5.5 in /playground

[dependabot[bot]]

Bumps color-string from 1.5.4 to 1.5.5.

Release notes

Sourced from color-string's releases.

1.5.5 (Patch/Security Release) - hwb() ReDos patch (low-severity)

Release notes copied verbatim from the commit message, which can be found here: 0789e21284c33d89ebc4ab4ca6f759b9375ac9d3

Discovered by Yeting Li, c/o Colin Ife via Snyk.io.
A ReDos (Regular Expression Denial of Service) vulnerability
was responsibly disclosed to me via email by Colin on
Mar 5 2021 regarding an exponential time complexity for
linearly increasing input lengths for hwb() color strings.
Strings reaching more than 5000 characters would see several
milliseconds of processing time; strings reaching more than
50,000 characters began seeing 1500ms (1.5s) of processing time.
The cause was due to a the regular expression that parses
hwb() strings - specifically, the hue value - where
the integer portion of the hue value used a 0-or-more quantifier
shortly thereafter followed by a 1-or-more quantifier.
This caused excessive backtracking and a cartesian scan,
resulting in exponential time complexity given a linear
increase in input length.
Thank you Yeting Li and Colin Ife for bringing this to my
attention in a secure, responsible and professional manner.
A CVE will not be assigned for this vulnerability.

Commits

• 966ae4d 1.5.5
• 0789e21 fix ReDos in hwb() parser (low-severity)
• See full diff in compare view

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[bidoubiwa]

bors merge

[bors[bot]]

This PR was included in a batch that successfully built, but then failed to merge into main. It will not be retried.

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{"message":"At least 1 approving review is required by reviewers with write access.","documentation_url":"https://docs.github.com/articles/about-protected-branches"}

[bidoubiwa]

@dependabot recreate

[bors[bot]]

Build succeeded:

• linter-check
• Tests (Node.js 12)
• Tests (Node.js 14)