build(deps): Bump gulp-imagemin from 6.1.1 to 6.2.0 (#472)

Bumps [gulp-imagemin](https://github.com/sindresorhus/gulp-imagemin) from 6.1.1 to 6.2.0.
- [Release notes](https://github.com/sindresorhus/gulp-imagemin/releases)
- [Commits](sindresorhus/gulp-imagemin@v6.1.1...v6.2.0)

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

yarn.lock

@@ -5095,9 +5095,9 @@ gulp-if@^3.0.0:
     through2 "^3.0.1"
 
 gulp-imagemin@^6.1.0:
-  version "6.1.1"
-  resolved "https://registry.yarnpkg.com/gulp-imagemin/-/gulp-imagemin-6.1.1.tgz#8e6fdecd029930f2ce6e129b26601fd2c2613d6e"
-  integrity sha512-fqaSR8bMc5lhqa6HzRPuJaDY6lY7rcCipe6WtqQ5+hNYTCSPYjXic+1gvFG1+8X879gjVJmIxwmqIbfjuMqTpQ==
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/gulp-imagemin/-/gulp-imagemin-6.2.0.tgz#14ad2ab9bbb4504b6a7694c0be2eaac25f8bfbf7"
+  integrity sha512-luHT+8kUz60KGzjJLUFzaPjl4b38UQLj8BJGkpJACRjiVEuzjohMOmLagkgXs+Rs4vYaUBr9tt1F/vLizaxgGg==
   dependencies:
     chalk "^2.4.1"
     fancy-log "^1.3.2"