Fix updating an up

OC_App has been made strict recently and the updater code was not
compatible to this. This adds the array to string conversion of the
Nextcloud version and fixes a typo in OC_App (sstring -> string)

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

lib/private/Updater.php

@@ -385,7 +385,7 @@ class Updater extends BasicEmitter {
 	private function checkAppsRequirements() {
 		$isCoreUpgrade = $this->isCodeUpgrade();
 		$apps = OC_App::getEnabledApps();
-		$version = Util::getVersion();
+		$version = implode('.', Util::getVersion());
 		$disabledApps = [];
 		$appManager = \OC::$server->getAppManager();
 		foreach ($apps as $app) {

lib/private/legacy/app.php

@@ -915,7 +915,7 @@ class OC_App {
 	 * @param string $appId
 	 * @return bool
 	 */
-	public static function updateApp(sstring $appId): bool {
+	public static function updateApp(string $appId): bool {
 		$appPath = self::getAppPath($appId);
 		if($appPath === false) {
 			return false;