Remove deprecated VSCode plugin

Author: HexDecimal

.vscode/extensions.json

@@ -3,7 +3,6 @@
     // Extension identifier format: ${publisher}.${name}. Example: vscode.csharp
     // List of extensions which should be recommended for users of this workspace.
     "recommendations": [
-        "austin.code-gnu-global",
         "editorconfig.editorconfig",
         "ms-python.python",
         "ms-python.vscode-pylance",