Update beberlei/assert for PHP 8 compatibility

Run `composer update beberlei/assert` using composer 2.3.8 on PHP 8.1.7

Updating other packages without updating this fails with:

```
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - beberlei/assert v3.2.2 requires php ^7 -> your php version (8.1.7) does not satisfy that requirement.
    - spomky-labs/otphp v10.0.1 requires beberlei/assert ^3.0 -> satisfiable by beberlei/assert[v3.2.2].
    - spomky-labs/otphp is locked to version v10.0.1 and an update of this package was not requested.
```

vendor/beberlei/assert/lib/Assert/LazyAssertionException.php

@@ -23,10 +23,8 @@ class LazyAssertionException extends InvalidArgumentException
 
     /**
      * @param InvalidArgumentException[] $errors
-     *
-     * @return self
      */
-    public static function fromErrors(array $errors)
+    public static function fromErrors(array $errors): self
     {
         $message = \sprintf('The following %d assertions failed:', \count($errors))."\n";
 
@@ -45,7 +43,10 @@ class LazyAssertionException extends InvalidArgumentException
         $this->errors = $errors;
     }
 
-    public function getErrorExceptions()
+    /**
+     * @return InvalidArgumentException[]
+     */
+    public function getErrorExceptions(): array
     {
         return $this->errors;
     }