Update E2E test to target iOS 13.3

Xcode 11.3.1 added support for iOS 13.3

PiperOrigin-RevId: 309402015
diff --git a/src/TulsiEndToEndTests/TulsiEndToEndTest.swift b/src/TulsiEndToEndTests/TulsiEndToEndTest.swift
index 512c58b..32e8706 100644
--- a/src/TulsiEndToEndTests/TulsiEndToEndTest.swift
+++ b/src/TulsiEndToEndTests/TulsiEndToEndTest.swift
@@ -21,7 +21,7 @@
 // generated xcodeproj by running the projects unit tests.
 class TulsiEndToEndTest: BazelIntegrationTestCase {
   fileprivate static let simulatorName = "tulsie2e-\(UUID().uuidString.prefix(8))"
-  fileprivate static let targetVersion = "12.2"
+  fileprivate static let targetVersion = "13.3"
 
   let fileManager = FileManager.default
   var runfilesWorkspaceURL: URL! = nil