Phpstan: Remove now obsolete version based baseline files

Phpstan now ignores these error messages, so we can remove these.

Author: sukhwinder33445

phpstan-baseline-8.2+.neon

@@ -7,12 +7,6 @@
     $includes[] = __DIR__ . '/phpstan-baseline-7x.neon';
 }
 
-if (PHP_VERSION_ID >= 80200) {
-    $includes[] = __DIR__ . '/phpstan-baseline-8.2+.neon';
-} else {
-    $includes[] = __DIR__ . '/phpstan-baseline-pre-8.2.neon';
-}
-
 return [
     'includes' => $includes
 ];