Fix PublicKeyTokenProviderTest import and mock

* IDBConnection import missing
* Atomic doesn't need a mock

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Author: ChristophWurst

tests/lib/Authentication/Token/PublicKeyTokenProviderTest.php

@@ -36,6 +36,7 @@
 use OCP\AppFramework\Db\DoesNotExistException;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\IConfig;
+use OCP\IDBConnection;
 use OCP\Security\ICrypto;
 use PHPUnit\Framework\MockObject\MockObject;
 use Psr\Log\LoggerInterface;
@@ -73,9 +74,6 @@ protected function setUp(): void {
 				['openssl', [], []],
 			]);
 		$this->db = $this->createMock(IDBConnection::class);
-		$this->db->method('atomic')->willReturnCallback(function ($cb) {
-			return $cb();
-		});
 		$this->logger = $this->createMock(LoggerInterface::class);
 		$this->timeFactory = $this->createMock(ITimeFactory::class);
 		$this->time = 1313131;