Fix the broken iOS OSS job

Summary:
Fixes the iOS OSS job which was failing. The root cause of the problem is as follows:

- RSocket was referring the master branch of rsocket/rsocket-cpp, fixed it by forking it and making its own release, unfortunately they don't make a release.
- Folly referred to the January's release. The current master branch of RSocket doesn't build with the latest release of the Folly, [this commit](b51dc569eb) is responsible for the breakage. Thus I made a Rsocket release, right before this [commit](b51dc569eb), so that it builds.Although, the current master branch of Folly builds with the current master branch of rsocket, but we will have to wait on Folly team to make a release. Once they do that I will update bit RSocket and Folly releases.

Reviewed By: jknoxville

Differential Revision: D14668686

fbshipit-source-id: 6b0362632c26355a69a3f33a031b71c88e7dd45b

iOS/FlipperKit.podspec

@@ -61,7 +61,7 @@ Pod::Spec.new do |spec|
     ss.dependency 'FlipperKit/FBCxxUtils'
     ss.dependency 'FlipperKit/CppBridge'
     ss.dependency 'FlipperKit/FKPortForwarding'
-    ss.dependency 'Flipper-Folly', '~>1.2'
+    ss.dependency 'Flipper-Folly', '1.3.0'
     ss.dependency 'Flipper', '~>'+flipperkit_version
     ss.dependency 'OpenSSL-Static', '1.0.2.c1'
     ss.compiler_flags = folly_compiler_flags