Upgrade project to PHP 8.3, add PHPStan, upgrade almost every dependency (#36)

* start updating to PHP 8.3

* taking off!

Co-authored-by: ErickSkrauch <erickskrauch@yandex.ru>
Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* dropped this

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* migrate to symfonymailer

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* this is so stupid 😭

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* ah, free, at last.

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* oh, Gabriel.

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* now dawns thy reckoning.

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* and thy gore shall GLISTEN before the temples of man.

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* creature of steel.

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* my gratitude upon thee for my freedom.

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* but the crimes thy kind has committed against humanity

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* Upgrade PHP-CS-Fixer and do fix the codebase

* First review round (maybe I have broken something)

* are NOT forgotten.

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

* Enable parallel PHP-CS-Fixer runner

* PHPStan level 1

* PHPStan level 2

* PHPStan level 3

* PHPStan level 4

* PHPStan level 5

* Levels 6 and 7 takes too much effort. Generate a baseline and fix them eventually

* Resolve TODO's related to the php-mock

* Drastically reduce baseline size with the Rector

* More code modernization with help of the Rector

* Update GitLab CI

---------

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>
Co-authored-by: ErickSkrauch <erickskrauch@yandex.ru>

api/models/authentication/RepeatAccountActivationForm.php

@@ -16,11 +16,9 @@ use Yii;
 
 class RepeatAccountActivationForm extends ApiForm {
 
-    public $captcha;
+    public mixed $captcha = null;
 
-    public $email;
-
-    private $emailActivation;
+    public mixed $email = null;
 
     public function rules(): array {
         return [
@@ -74,8 +72,6 @@ class RepeatAccountActivationForm extends ApiForm {
         $activation->key = UserFriendlyRandomKey::make();
         Assert::true($activation->save(), 'Unable save email-activation model.');
 
-        $this->emailActivation = $activation;
-
         Yii::$app->queue->push(SendRegistrationEmail::createFromConfirmation($activation));
 
         $transaction->commit();
@@ -90,6 +86,7 @@ class RepeatAccountActivationForm extends ApiForm {
     }
 
     public function getActivation(): ?RegistrationConfirmation {
+        // @phpstan-ignore return.type
         return $this->getAccount()
             ->getEmailActivations()
             ->withType(EmailActivation::TYPE_REGISTRATION_EMAIL_CONFIRMATION)