feat(docker-image)!: Update mcr.microsoft.com/vscode/devcontainers/ja…

…vascript-node Docker tag to v20 (#182)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| mcr.microsoft.com/vscode/devcontainers/javascript-node | final | major | `18-bullseye` -> `20-bullseye` |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://togithub.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNi42NC4zIiwidXBkYXRlZEluVmVyIjoiMzYuNjQuMyIsInRhcmdldEJyYW5jaCI6Im1hc3RlciJ9-->

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # [Choice] Node.js version (use -bullseye variants on local arm64/Apple Silicon): 18, 16, 14, 18-bullseye, 16-bullseye, 14-bullseye, 18-buster, 16-buster, 14-buster
-ARG VARIANT=18-bullseye@sha256:9726a4f58729e711b6e34c11d7ab403db378c2bb373416afb6c28049b7ccd586
+ARG VARIANT=20-bullseye@sha256:ee2a35f1cfec2f7de4d0033935b1169afe078624558e98b4937c6f687fd7b745
 FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:${VARIANT}
 
 ARG WATCHEXEC_VERSION=1.20.5