minor symfony#59371 [Lock] Use a WeakMap as store registry (rosier)

This PR was merged into the 7.3 branch.

Discussion
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[Lock] Use a WeakMap as store registry

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

As suggested here symfony#59355 (comment)

Commits
-------

ba1c9e3 Use a WeakMap as store registry

Author: nicolas-grekas

src/Symfony/Component/Lock/Store/DoctrineDbalPostgreSqlStore.php

@@ -33,7 +33,6 @@
 class DoctrineDbalPostgreSqlStore implements BlockingSharedLockStoreInterface, BlockingStoreInterface
 {
     private Connection $conn;
-    private static array $storeRegistry = [];
 
     /**
      * You can either pass an existing database connection a Doctrine DBAL Connection
@@ -278,8 +277,8 @@ private function filterDsn(#[\SensitiveParameter] string $dsn): string
 
     private function getInternalStore(): SharedLockStoreInterface
     {
-        $namespace = spl_object_hash($this->conn);
+        static $storeRegistry = new \WeakMap();
 
-        return self::$storeRegistry[$namespace] ??= new InMemoryStore();
+        return $storeRegistry[$this->conn] ??= new InMemoryStore();
     }
 }

src/Symfony/Component/Lock/Store/PostgreSqlStore.php

@@ -31,7 +31,6 @@ class PostgreSqlStore implements BlockingSharedLockStoreInterface, BlockingStore
     private ?string $username = null;
     private ?string $password = null;
     private array $connectionOptions = [];
-    private static array $storeRegistry = [];
 
     /**
      * You can either pass an existing database connection as PDO instance or
@@ -283,8 +282,8 @@ private function checkDriver(): void
 
     private function getInternalStore(): SharedLockStoreInterface
     {
-        $namespace = spl_object_hash($this->getConnection());
+        static $storeRegistry = new \WeakMap();
 
-        return self::$storeRegistry[$namespace] ??= new InMemoryStore();
+        return $storeRegistry[$this->getConnection()] ??= new InMemoryStore();
     }
 }