update realm lib

Nextcloud.xcodeproj/project.pbxproj

@@ -2929,7 +2929,7 @@
 			repositoryURL = "https://github.com/realm/realm-cocoa";
 			requirement = {
 				kind = exactVersion;
-				version = 10.14.0;
+				version = 10.15.0;
 			};
 		};
 		F786D58B253454BF00E3DD7B /* XCRemoteSwiftPackageReference "ios-communication-library" */ = {