Runtime configuration switching now supported

What's Changed

• Sean/mobile 490 ios enable runtime configuration switching in mobile sdk by @seanperez29 in https://github.com/clerk/clerk-ios/pull/409
• Bump SDK version to 1.1.3 by @seanperez29 in https://github.com/clerk/clerk-ios/pull/412

Full Changelog: https://github.com/clerk/clerk-ios/compare/1.1.2...1.1.3