fix: pin smithy and crt versions in 0.2.6 (#635)

Author: atierian

Package.swift

@@ -320,8 +320,8 @@ let package = Package(
         .library(name: "AWSXRay", targets: ["AWSXRay"]),
     ],
     dependencies: [
-        .package(name: "AwsCrt", url: "https://github.com/awslabs/aws-crt-swift.git", from: "0.2.2"),
-        .package(name: "ClientRuntime", url: "https://github.com/awslabs/smithy-swift.git", from: "0.2.5")
+      .package(name: "AwsCrt", url: "https://github.com/awslabs/aws-crt-swift.git", .exact("0.2.2")),
+      .package(name: "ClientRuntime", url: "https://github.com/awslabs/smithy-swift.git", .exact("0.2.5"))
     ],
     targets: [
         .target(