Deps: Bump Containerization to 0.19.0 (#1015)

Has read-only rootfs support.

Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "928d12d151bf6f1a66dad38525ddf6aecbc8390889e72345fe353b89fc304830",
+  "originHash" : "cdb00eae6b7604ecbcae4d6486a6e5e0f5f89e93c1e645b50a7c4758b8ef38ca",
   "pins" : [
     {
       "identity" : "async-http-client",
@@ -15,8 +15,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/apple/containerization.git",
       "state" : {
-        "revision" : "dcbc7bf71da8fe993f6d19214adb8179eec7d02a",
-        "version" : "0.18.0"
+        "revision" : "2f55d75fec39474212170439b73274006200e2e2",
+        "version" : "0.19.0"
       }
     },
     {

Package.swift

@@ -23,7 +23,7 @@ import PackageDescription
 let releaseVersion = ProcessInfo.processInfo.environment["RELEASE_VERSION"] ?? "0.0.0"
 let gitCommit = ProcessInfo.processInfo.environment["GIT_COMMIT"] ?? "unspecified"
 let builderShimVersion = "0.7.0"
-let scVersion = "0.18.0"
+let scVersion = "0.19.0"
 
 let package = Package(
     name: "container",