Use Node 20 in Codespaces (#48646)

Co-authored-by: hubwriter <[email protected]>

Author: Peter Bengtsson

.devcontainer/Dockerfile

@@ -1,8 +1,8 @@
-# See here for image contents: https://github.com/microsoft/vscode-dev-containers/blob/main/containers/javascript-node/.devcontainer/base.Dockerfile
+# To find available Node images, see https://mcr.microsoft.com/en-us/product/devcontainers/javascript-node/tags
 
 # [Choice] Node.js version
-ARG VARIANT="18-buster"
-FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:0-${VARIANT}
+ARG VARIANT="dev-20-bullseye"
+FROM mcr.microsoft.com/devcontainers/javascript-node:${VARIANT}
 
 # [Optional] Uncomment this section to install additional OS packages.
 # RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \

.devcontainer/devcontainer.json

@@ -6,7 +6,7 @@
     "build": {
         "dockerfile": "Dockerfile",
         // Update 'VARIANT' to pick a Node version
-        "args": { "VARIANT": "18" }
+        "args": { "VARIANT": "20" }
     },
 
     // Set *default* container specific settings.json values on container create.