Merge branch '7.2' into 7.3

* 7.2:
  [SecurityBundle] Do not replace authenticators service by their traceable version
  [Finder] Fix using `==` as default operator in `DateComparator`
  bug #54854 [Stopwatch] undefined key error when trying to fetch a missing section
  [HttpFoundation] Avoid mime type guess with temp files in `BinaryFileResponse`
  choose the correctly cased class name for the MariaDB platform

Author: fabpot

Comparator/DateComparator.php

@@ -36,7 +36,7 @@ public function __construct(string $test)
             throw new \InvalidArgumentException(\sprintf('"%s" is not a valid date.', $matches[2]));
         }
 
-        $operator = $matches[1] ?? '==';
+        $operator = $matches[1] ?: '==';
         if ('since' === $operator || 'after' === $operator) {
             $operator = '>';
         }

Tests/Comparator/DateComparatorTest.php

@@ -59,6 +59,7 @@ public static function getTestData()
             ['after 2005-10-10', [strtotime('2005-10-15')], [strtotime('2005-10-09')]],
             ['since 2005-10-10', [strtotime('2005-10-15')], [strtotime('2005-10-09')]],
             ['!= 2005-10-10', [strtotime('2005-10-11')], [strtotime('2005-10-10')]],
+            ['2005-10-10', [strtotime('2005-10-10')], [strtotime('2005-10-11')]],
         ];
     }
 }