fix: patch up PHP 7.4 issues

Author: mychidarko

src/Auth.php

@@ -665,7 +665,7 @@ public function middleware(string $middleware, callable $callback)
 
         if ($middleware === 'is') {
             return app()->registerMiddleware('is', function ($role) use ($callback) {
-                if (!$this->user() || $this->user()?->isNot($role)) {
+                if (!$this->user() || ($this->user() && $this->user()->isNot($role))) {
                     $callback($role);
                     exit;
                 }
@@ -674,7 +674,7 @@ public function middleware(string $middleware, callable $callback)
 
         if ($middleware === 'isNot') {
             return app()->registerMiddleware('isNot', function ($role) use ($callback) {
-                if (!$this->user() || $this->user()?->is($role)) {
+                if (!$this->user() || ($this->user() && $this->user()->is($role))) {
                     $callback($role);
                     exit;
                 }
@@ -683,7 +683,7 @@ public function middleware(string $middleware, callable $callback)
 
         if ($middleware === 'can') {
             return app()->registerMiddleware('can', function ($role) use ($callback) {
-                if (!$this->user() || $this->user()?->cannot($role)) {
+                if (!$this->user() || ($this->user() && $this->user()->cannot($role))) {
                     $callback($role);
                     exit;
                 }
@@ -692,7 +692,7 @@ public function middleware(string $middleware, callable $callback)
 
         if ($middleware === 'cannot') {
             return app()->registerMiddleware('cannot', function ($role) use ($callback) {
-                if (!$this->user() || $this->user()?->can($role)) {
+                if (!$this->user() || ($this->user() && $this->user()->can($role))) {
                     $callback($role);
                     exit;
                 }

src/Auth/UsesRoles.php

@@ -86,7 +86,7 @@ public function is($role): bool
             return count(array_intersect($role, $this->roles)) > 0;
         }
 
-        return in_array($role, haystack: $this->roles);
+        return in_array($role, $this->roles);
     }
 
     /**