Fix bazel builds by removing transitive dependencies on http://zlib.net/
Fix bazel builds by removing transitive dependencies on http://zlib.net/

Source version bumps:
- protobuf: 3.9 -> 3.10
- grpc: 1.23 -> 1.25
- bazel-skylib: 0.8 -> 1.0

Add Apple/Swift dependencies to WORKSPACE (brought in from new versions)

PiperOrigin-RevId: 281212714

tensorflow/federated,tensorflow/federated,tensorflow/federated