chore: upgrade dev env to node 18

Author: openscript

.devcontainer/Dockerfile

@@ -1,6 +1,6 @@
 # See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.145.1/containers/typescript-node/.devcontainer/base.Dockerfile
 
-ARG VARIANT="16-bullseye"
+ARG VARIANT="18-bullseye"
 FROM mcr.microsoft.com/vscode/devcontainers/typescript-node:0-${VARIANT}
 
 # [Optional] Uncomment this section to install additional OS packages.

.devcontainer/devcontainer.json

@@ -4,7 +4,7 @@
   "name": "React DSV Import",
   "build": {
     "dockerfile": "Dockerfile",
-    "args": { "VARIANT": "16" }
+    "args": { "VARIANT": "18" }
   },
 
   // Add the IDs of extensions you want installed when the container is created.