Bump default Xcode version to 11.1
Xcode 11.0 still causes an expired certificate error on some machines.
@@ -490,7 +490,7 @@ DEFAULT_PLATFORM = "ubuntu1804"
# release platform for all Linux downstream tests.
LINUX_BINARY_PLATFORM = "centos7"
-DEFAULT_XCODE_VERSION = "11.0"
+DEFAULT_XCODE_VERSION = "11.1"
XCODE_VERSION_REGEX = re.compile(r"^\d+\.\d+(\.\d+)?$")
ENCRYPTED_SAUCELABS_TOKEN = """
