minor #41763 [WebLink] fix types on Link::withAttribute() (nicolas-grekas)

This PR was merged into the 4.4 branch.

Discussion
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[WebLink] fix types on Link::withAttribute()

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #40126
| License       | MIT
| Doc PR        | -

Related to 10e52348a2

Commits
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29903e2c35 [WebLink] fix types on Link::withAttribute()

src/Symfony/Component/WebLink/Link.php

@@ -46,7 +46,7 @@ class Link implements EvolvableLinkInterface
     private $rel = [];
 
     /**
-     * @var string[]
+     * @var array<string, string|bool|string[]>
      */
     private $attributes = [];
 
@@ -132,6 +132,8 @@ class Link implements EvolvableLinkInterface
     /**
      * {@inheritdoc}
      *
+     * @param string|bool|string[] $value
+     *
      * @return static
      */
     public function withAttribute($attribute, $value)