chore(deps): bump color-string from 1.5.4 to 1.6.0 in /functions

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](https://github.com/Qix-/color-string/compare/1.5.4...1.6.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

functions/package-lock.json

@@ -661,9 +661,9 @@
       "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA=="
     },
     "color-string": {
-      "version": "1.5.4",
-      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.5.4.tgz",
-      "integrity": "sha512-57yF5yt8Xa3czSEW1jfQDE79Idk0+AkN/4KWad6tbdxUmAs3MvjxlWSWD4deYytcRfoZ9nhKyFl1kj5tBvidbw==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.6.0.tgz",
+      "integrity": "sha512-c/hGS+kRWJutUBEngKKmk4iH3sD59MBkoxVapS/0wgpCz2u7XsNloxknyvBhzwEs1IbV36D9PwqLPJ2DTu3vMA==",
       "requires": {
         "color-name": "^1.0.0",
         "simple-swizzle": "^0.2.2"