qa: remove SensitiveParameter from Redis##auth stub

I was expecting that it might have a benefit regarding tentative types but it seems that psalm does not use that and thus was suggested to be removed.

Signed-off-by: Maximilian Bösing <2189546+boesing@users.noreply.github.com>

stubs/extensions/redis.phpstub

@@ -37,7 +37,7 @@ class Redis {
     public function append(string $key, string $value) {}
 
     /** @param array{string,string}|array{string}|string $credentials */
-    public function auth(#[\SensitiveParameter] mixed $credentials): bool {}
+    public function auth(mixed $credentials): bool {}
 
     public function bgSave(): bool {}