message: Removes duplicate swift in labeler
  Removed grpc tag from swift label set & removes duplicate swift label
diff: @@ -19,7 +19,6 @@ swift:
  - tests/FlatBuffers.Benchmarks.swift/**/*
  - tests/FlatBuffers.Test.Swift/**/*
  - src/idl_gen_swift.cpp
  - - grpc/**/*swift*
  javascript:
  - ./**/*.js
  @@ -67,11 +66,6 @@ dart:
  - ./**/*.dart
  - src/idl_gen_dart.cpp
  -swift:
  - - ./**/*.swift
  - - swift/**/*
  - - src/idl_gen_swift.cpp
  -
  c++:
  - ./**/*.cc
  - ./**/*.cpp
  