Bump dependency versions (#64)

IntegrationTests/grpc-interop-tests/Package.swift

@@ -24,11 +24,11 @@ let package = Package(
     .package(path: "../.."),
     .package(
       url: "https://github.com/grpc/grpc-swift-protobuf",
-      branch: "main"
+      exact: "1.0.0-rc.1"
     ),
     .package(
       url: "https://github.com/grpc/grpc-swift-extras",
-      branch: "main"
+      exact: "1.0.0-rc.1"
     ),
     .package(
       url: "https://github.com/apple/swift-argument-parser",

IntegrationTests/grpc-performance-tests/Package.swift

@@ -24,7 +24,7 @@ let package = Package(
     .package(path: "../.."),
     .package(
       url: "https://github.com/grpc/grpc-swift-protobuf",
-      branch: "main"
+      exact: "1.0.0-rc.1"
     ),
     .package(
       url: "https://github.com/apple/swift-argument-parser",

Package.swift

@@ -35,7 +35,7 @@ let products: [Product] = [
 let dependencies: [Package.Dependency] = [
   .package(
     url: "https://github.com/grpc/grpc-swift.git",
-    exact: "2.0.0-beta.3"
+    exact: "2.0.0-rc.1"
   ),
   .package(
     url: "https://github.com/apple/swift-nio.git",