Merge branch '7.1' into 7.2

* 7.1:
  relax assertions on generated hashes
  [Messenger] ensure exception on rollback does not hide previous exception
  require the writer to implement getFormats() in the translation:extract
  don't require fake notifier transports to be installed as non-dev dependencies
  Remove 5.4 branch from PR template
  [Scheduler] Fix optional count variable in testGetNextRunDates

Tests/Trigger/PeriodicalTriggerTest.php

@@ -105,9 +105,9 @@ public static function provideForToString()
     /**
      * @dataProvider providerGetNextRunDates
      */
-    public function testGetNextRunDates(\DateTimeImmutable $from, TriggerInterface $trigger, array $expected, int $count = 0)
+    public function testGetNextRunDates(\DateTimeImmutable $from, TriggerInterface $trigger, array $expected, int $count)
     {
-        $this->assertEquals($expected, $this->getNextRunDates($from, $trigger, $count ?? \count($expected)));
+        $this->assertEquals($expected, $this->getNextRunDates($from, $trigger, $count));
     }
 
     public static function providerGetNextRunDates(): iterable