LibWeb: Return String from CSSStyleRule::selector_text()

Author: https://github.com/AtkinsSJ
Commit: d344c50663
Pull-request: https://github.com/SerenityOS/serenity/pull/22115

Userland/Libraries/LibWeb/CSS/CSSStyleRule.cpp

@@ -89,10 +89,10 @@ String CSSStyleRule::serialized() const
 }
 
 // https://www.w3.org/TR/cssom/#dom-cssstylerule-selectortext
-DeprecatedString CSSStyleRule::selector_text() const
+String CSSStyleRule::selector_text() const
 {
     // The selectorText attribute, on getting, must return the result of serializing the associated group of selectors.
-    return serialize_a_group_of_selectors(selectors()).to_deprecated_string();
+    return serialize_a_group_of_selectors(selectors());
 }
 
 // https://www.w3.org/TR/cssom/#dom-cssstylerule-selectortext