bug #34516 [HttpKernel] drop return type declaration (xabbuh)

This PR was merged into the 4.4 branch.

Discussion
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[HttpKernel] drop return type declaration

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #34508
| License       | MIT
| Doc PR        |

The configured memory limit can exceed the range that can be represented
by an integer.

Commits
-------

93685026b0 drop return type declaration

src/Symfony/Component/HttpKernel/DataCollector/MemoryDataCollector.php

@@ -93,7 +93,10 @@ class MemoryDataCollector extends DataCollector implements LateDataCollectorInte
         return 'memory';
     }
 
-    private function convertToBytes(string $memoryLimit): int
+    /**
+     * @return int|float
+     */
+    private function convertToBytes(string $memoryLimit)
     {
         if ('-1' === $memoryLimit) {
             return -1;