Replace implicit nullable types in parameter declarations

src/app/Console/Commands/Traits/PrettyCommandOutput.php

@@ -116,7 +116,7 @@ public function box($header, $color = 'green')
      *
      * @return void
      */
-    public function listChoice(string $question, array $options, string $default = 'no', string $hint = null)
+    public function listChoice(string $question, array $options, string $default = 'no', ?string $hint = null)
     {
         foreach ($options as $key => $option) {
             $value = $key + 1;

src/app/Library/Auth/PasswordBroker.php

@@ -20,7 +20,7 @@ class PasswordBroker extends OriginalPasswordBroker
      * @param  array  $credentials
      * @return string
      */
-    public function sendResetLink(array $credentials, Closure $callback = null)
+    public function sendResetLink(array $credentials, ?Closure $callback = null)
     {
         // First we will check to see if we found a user at the given credentials and
         // if we did not we will redirect back to this current URI with a piece of

src/app/Library/Database/DatabaseSchema.php

@@ -22,7 +22,7 @@ public static function getForTable(string $table, string $connection)
         return self::$schema[$connection][$table] ?? null;
     }
 
-    public static function getTables(string $connection = null): array
+    public static function getTables(?string $connection = null): array
     {
         $connection = $connection ?: config('database.default');
 
@@ -53,7 +53,7 @@ public function listTableIndexes(string $connection, string $table)
         return self::getIndexColumnNames($connection, $table);
     }
 
-    public function getManager(string $connection = null)
+    public function getManager(?string $connection = null)
     {
         $connection = $connection ?: config('database.default');