Update to laravel 7

vendor/symfony/css-selector/Parser/Tokenizer/Tokenizer.php

@@ -50,10 +50,8 @@ class Tokenizer
 
     /**
      * Tokenize selector source code.
-     *
-     * @return TokenStream
      */
-    public function tokenize(Reader $reader)
+    public function tokenize(Reader $reader): TokenStream
     {
         $stream = new TokenStream();
 

vendor/symfony/css-selector/Parser/Tokenizer/TokenizerEscaping.php

@@ -58,6 +58,8 @@ class TokenizerEscaping
             if (0x10000 > $c) {
                 return \chr(0xE0 | $c >> 12).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
             }
+
+            return '';
         }, $value);
     }
 }