Merge branch '6.0' into 6.1

* 6.0:
  Fix tests
  Bump Symfony version to 6.0.7
  Update VERSION for 6.0.6
  Update CHANGELOG for 6.0.6
  Bump Symfony version to 5.4.7
  Update VERSION for 5.4.6
  Update CHANGELOG for 5.4.6
  Bump Symfony version to 4.4.40
  Update VERSION for 4.4.39
  Update CONTRIBUTORS for 4.4.39
  Update CHANGELOG for 4.4.39
  [redis-messenger] remove undefined array key warnings
  do not pass DBAL connections to PDO adapters
  [HttpFoundation] Fix PHP 8.1 deprecation in isNotModified

Author: nicolas-grekas

Response.php

@@ -1064,8 +1064,7 @@ public function isNotModified(Request $request): bool
         $lastModified = $this->headers->get('Last-Modified');
         $modifiedSince = $request->headers->get('If-Modified-Since');
 
-        if ($ifNoneMatchEtags = $request->getETags()) {
-            $etag = $this->getEtag();
+        if (($ifNoneMatchEtags = $request->getETags()) && (null !== $etag = $this->getEtag())) {
             if (0 == strncmp($etag, 'W/', 2)) {
                 $etag = substr($etag, 2);
             }

Tests/ResponseTest.php

@@ -275,6 +275,20 @@ public function testIsNotModifiedIfModifiedSinceAndEtagWithoutLastModified()
         $this->assertFalse($response->isNotModified($request));
     }
 
+    public function testIfNoneMatchWithoutETag()
+    {
+        $request = new Request();
+        $request->headers->set('If-None-Match', 'randomly_generated_etag');
+
+        $this->assertFalse((new Response())->isNotModified($request));
+
+        // Test wildcard
+        $request = new Request();
+        $request->headers->set('If-None-Match', '*');
+
+        $this->assertFalse((new Response())->isNotModified($request));
+    }
+
     public function testIsValidateable()
     {
         $response = new Response('', 200, ['Last-Modified' => $this->createDateTimeOneHourAgo()->format(\DATE_RFC2822)]);