Fix isAnonymous() always returning false on Symfony 6.x (#1240)

* Fix isAnonymous() always returning false on Symfony 6.x

IS_AUTHENTICATED_ANONYMOUSLY was removed from AuthenticatedVoter in
Symfony 6.x (deprecated since 5.4). When using #[GQL\Access('isAnonymous()')]
on a Provider field, the access check always returned false, causing every
request to get "Access denied to this field" regardless of auth state.

PUBLIC_ACCESS is the correct replacement since Symfony 5.4 and has the
same semantics: it always grants access.

* Update IsAnonymousTest for Symfony 6.x PUBLIC_ACCESS change

Author: mfaivre-simplis

src/Security/Security.php

@@ -104,7 +104,7 @@ public function hasRole(string $role): bool
 
     public function isAnonymous(): bool
     {
-        return $this->isGranted('IS_AUTHENTICATED_ANONYMOUSLY');
+        return $this->isGranted('PUBLIC_ACCESS');
     }
 
     public function isAuthenticated(): bool

tests/ExpressionLanguage/ExpressionFunction/Security/IsAnonymousTest.php

@@ -17,10 +17,7 @@ protected function getFunctions()
 
     public function testEvaluator(): void
     {
-        $security = $this->getSecurityIsGrantedWithExpectation(
-            'IS_AUTHENTICATED_ANONYMOUSLY',
-            $this->any()
-        );
+        $security = $this->getSecurityIsGrantedWithExpectation('PUBLIC_ACCESS', $this->any());
         $services = $this->createGraphQLServices(['security' => $security]);
 
         $isAnonymous = $this->expressionLanguage->evaluate('isAnonymous()', [TypeGenerator::GRAPHQL_SERVICES => $services]);
@@ -29,6 +26,6 @@ public function testEvaluator(): void
 
     public function testIsAnonymous(): void
     {
-        $this->assertExpressionCompile('isAnonymous()', 'IS_AUTHENTICATED_ANONYMOUSLY');
+        $this->assertExpressionCompile('isAnonymous()', 'PUBLIC_ACCESS');
     }
 }