Raise swift version of dev container and format dev container config

feature/update-workflow

Author: roanutil

.devcontainer/devcontainer.json

@@ -1,44 +1,38 @@
 {
-	"name": "swift-argument-encoding",
-    "image": "swift:5.7",
-    "features": {
-        "ghcr.io/devcontainers/features/common-utils:2": {
-            "installZsh": "false",
-            "username": "vscode",
-            "userUid": "1000",
-            "userGid": "1000",
-            "upgradePackages": "false"
-        },
-        "ghcr.io/devcontainers/features/git:1": {
-            "version": "os-provided",
-            "ppa": "false"
-        }
+  "name": "swift-argument-encoding",
+  "image": "swift:5.8",
+  "features": {
+    "ghcr.io/devcontainers/features/common-utils:2": {
+      "installZsh": "false",
+      "username": "vscode",
+      "userUid": "1000",
+      "userGid": "1000",
+      "upgradePackages": "false"
     },
-    "runArgs": [
-        "--cap-add=SYS_PTRACE",
-        "--security-opt",
-        "seccomp=unconfined"
-    ],
-    // Configure tool-specific properties.
-    "customizations": {
-        // Configure properties specific to VS Code.
-        "vscode": {
-            // Set *default* container specific settings.json values on container create.
-            "settings": {
-                "lldb.library": "/usr/lib/liblldb.so"
-            },
-            // Add the IDs of extensions you want installed when the container is created.
-            "extensions": [
-                "sswg.swift-lang"
-            ]
-        }
-    },
-    // Use 'forwardPorts' to make a list of ports inside the container available locally.
-    // "forwardPorts": [],
+    "ghcr.io/devcontainers/features/git:1": {
+      "version": "os-provided",
+      "ppa": "false"
+    }
+  },
+  "runArgs": ["--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined"],
+  // Configure tool-specific properties.
+  "customizations": {
+    // Configure properties specific to VS Code.
+    "vscode": {
+      // Set *default* container specific settings.json values on container create.
+      "settings": {
+        "lldb.library": "/usr/lib/liblldb.so"
+      },
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": ["sswg.swift-lang"]
+    }
+  },
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
 
-    // Use 'postCreateCommand' to run commands after the container is created.
-    "postCreateCommand": "swift --version",
+  // Use 'postCreateCommand' to run commands after the container is created.
+  "postCreateCommand": "swift --version",
 
-    // Set `remoteUser` to `root` to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
-    "remoteUser": "vscode"
+  // Set `remoteUser` to `root` to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+  "remoteUser": "vscode"
 }