Allow Redis::pconnect to have 7 parameters

[Vaalyn]

This PR fixes a similar issue that was reported in phpstan/phpstan#9413 and subsequently fixed in #2442.

The Redis::pconnect method also accepts 7 parameters like the Redis::connect method, currently using all 7 available parameters on the pconnect method will show the error:

Method Redis::pconnect() invoked with 7 parameters, 1-5 required.

As can be seen here on the redis.stub.php the signature in the PHPStan function map is missing 2 parameters:

public function pconnect(string $host, int $port = 6379, float $timeout = 0, ?string $persistent_id = null, int $retry_interval = 0, float $read_timeout = 0, ?array $context = null): bool;

I've updated the function map to match the method signature.

[phpstan-bot]

You've opened the pull request against the latest branch 1.11.x. If your code is relevant on 1.10.x and you want it to be released sooner, please rebase your pull request and change its target to 1.10.x.

[ondrejmirtes]

I will merge this if you rebase it on top of 1.10.x.

[Vaalyn]

@ondrejmirtes 👍 done

[ondrejmirtes]

Thank you.