Bump color-string from 1.5.4 to 1.6.0 in /playgrounds/html

Bumps [color-string](https://github.com/Qix-/color-string) from 1.5.4 to 1.6.0.
- [Release notes](https://github.com/Qix-/color-string/releases)
- [Changelog](https://github.com/Qix-/color-string/blob/master/CHANGELOG.md)
- [Commits](Qix-/color-string@1.5.4...1.6.0)

---
updated-dependencies:
- dependency-name: color-string
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

playgrounds/html/yarn.lock

@@ -1537,9 +1537,9 @@ color-name@^1.0.0:
   integrity sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==
 
 color-string@^1.5.4:
-  version "1.5.4"
-  resolved "https://registry.yarnpkg.com/color-string/-/color-string-1.5.4.tgz#dd51cd25cfee953d138fe4002372cc3d0e504cb6"
-  integrity sha512-57yF5yt8Xa3czSEW1jfQDE79Idk0+AkN/4KWad6tbdxUmAs3MvjxlWSWD4deYytcRfoZ9nhKyFl1kj5tBvidbw==
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/color-string/-/color-string-1.6.0.tgz#c3915f61fe267672cb7e1e064c9d692219f6c312"
+  integrity sha512-c/hGS+kRWJutUBEngKKmk4iH3sD59MBkoxVapS/0wgpCz2u7XsNloxknyvBhzwEs1IbV36D9PwqLPJ2DTu3vMA==
   dependencies:
     color-name "^1.0.0"
     simple-swizzle "^0.2.2"