PHP 8.5 | Tokenizer/PHP: temporarily silence "Using null as an array offset" deprecation

When running the `NullsafeObjectOperatorTest`, the "Using null as an array offset" deprecation gets triggered in the tokenizer layer handling re-tokenization to `T_NULLABLE` and/or `T_INLINE_THEN`.

This should only be possible if the below code at the top of the loop would result in `$tokenType` being `null`, which shouldn't be possible....
https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/f1c9394f1724ed45ca42029da330ff5c702af2a9/src/Tokenizers/PHP.php#L2254-L2258

With this conundrum in mind, I'm electing to (temporarily) silence the deprecation notice for now until there is more time to investigate in more depth.

Ref: https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_using_values_null_as_an_array_offset_and_when_calling_array_key_exists

Author: jrfnl

src/Tokenizers/PHP.php

@@ -2268,7 +2268,7 @@ protected function tokenize($string)
                     }
 
                     if ($prevNonEmpty === null
-                        && isset(Tokens::$emptyTokens[$tokenType]) === false
+                        && @isset(Tokens::$emptyTokens[$tokenType]) === false
                     ) {
                         // Found the previous non-empty token.
                         if ($tokenType === ':' || $tokenType === ',' || $tokenType === T_ATTRIBUTE_END) {
@@ -2287,8 +2287,8 @@ protected function tokenize($string)
 
                     if ($tokenType === T_FUNCTION
                         || $tokenType === T_FN
-                        || isset(Tokens::$methodPrefixes[$tokenType]) === true
-                        || isset(Tokens::$scopeModifiers[$tokenType]) === true
+                        || @isset(Tokens::$methodPrefixes[$tokenType]) === true
+                        || @isset(Tokens::$scopeModifiers[$tokenType]) === true
                         || $tokenType === T_VAR
                         || $tokenType === T_READONLY
                     ) {
@@ -2311,7 +2311,7 @@ protected function tokenize($string)
                         break;
                     }
 
-                    if (isset(Tokens::$emptyTokens[$tokenType]) === false) {
+                    if (@isset(Tokens::$emptyTokens[$tokenType]) === false) {
                         $lastSeenNonEmpty = $tokenType;
                     }
                 }//end for