fix(TagGroup): fix css entry with nested children

[obdulia-losantos]

I'm not a css expert but in my project when the rollup task tries to minify the styles it displays this error.

warnings when minifying css:
▲ [WARNING] Unexpected "{" [css-syntax-error]

 .rs-tag-group>{margin-left:10px;margin-top:10px}

With the change the resultant css file (lib/TagGroup/styles/index.css) is:

/* stylelint-disable */
*[class*='rs-'] {
 -webkit-box-sizing: border-box;
         box-sizing: border-box;
}
*[class*='rs-']::before,
*[class*='rs-']::after {
 -webkit-box-sizing: border-box;
         box-sizing: border-box;
}
.rs-tag-group {
 margin: -10px 0 0 -10px;
}
.rs-tag-group > .rs-tag {
 margin-top: 10px;
 margin-left: 10px;
}

/*# sourceMappingURL=index.css.map */

While now is:

/* stylelint-disable */
*[class*='rs-'] {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}
*[class*='rs-']::before,
*[class*='rs-']::after {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}
.rs-tag-group {
  margin: -10px 0 0 -10px;
}
.rs-tag-group >  {
  margin-top: 10px;
  margin-left: 10px;
}

/*# sourceMappingURL=index.css.map */

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.58%. Comparing base (83052ed) to head (87937d6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3663   +/-   ##
=======================================
  Coverage   93.58%   93.58%           
=======================================
  Files         621      621           
  Lines       21950    21950           
  Branches     3014     3014           
=======================================
  Hits        20542    20542           
  Misses        729      729           
  Partials      679      679           

Flag	Coverage Δ
ChromeCi	93.53% <ø> (ø)
Firefox	92.99% <ø> (ø)

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[simonguo]

LGTM