chore(deps): upgrade dependencies for Astro 6 (DOCSDEV-60) (#218)

## PR Checklist
- [x] Linked issue added (e.g., `Fixes #123`)
- [x] I have run `bun run format` to ensure code is properly formatted
- [x] I have verified that `bun run lint` passes without errors
- [ ] If blog post was added:
  - [ ] Ensure images have been optimised
- [ ] Update dates to reflect the actual publishing date when merged
(file names, folder names, and frontmatter)

## Summary

Upgrades all dependencies to support Astro 6. Relates to DOCSDEV-60.

### Changes
- **Astro 6 upgrade**: astro 5.17.1 -> 6.1.8, starlight 0.37.5 ->
0.38.3, mdx 4.3.13 -> 5.0.3, node adapter 9.5.2 -> 10.0.5
- **Design system**: @interledger/docs-design-system 0.11.0 -> 0.12.0
- **Plugins**: starlight-links-validator 0.19.2 -> 0.23.0
- **Tooling**: eslint 9.x -> 10.2.1, prettier -> 3.8.3, and related
packages to latest
- **CI**: Node.js 18 -> 22, actions/checkout and actions/setup-node v3
-> v4
- **Zod migration**: moved `z` import from `astro:content` to
`astro/zod` (Astro 6 ships Zod 4)
- **Sidebar fix**: explicit `leftSidebarEnabled: true,
rightSidebarEnabled: true` for starlightFullViewMode (Zod compat)

Author: Infi-Knight

.github/workflows/deploy_gcs.yml

@@ -19,10 +19,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout your repository using git
-        uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
+        uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 22
 
       - name: Authenticate to Google Cloud
         uses: google-github-actions/auth@v2

.github/workflows/test-build.yml

@@ -16,10 +16,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout your repository using git
-        uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
+        uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 22
 
       - uses: oven-sh/setup-bun@v1
       - name: Install dependencies

.nvmrc

@@ -1 +1 @@
-lts/iron
+22

astro.config.mjs

@@ -24,7 +24,10 @@ export default defineConfig({
         starlightLinksValidator({
           exclude: ['/participation-guidelines']
         }),
-        starlightFullViewMode({ leftSidebarEnabled: false })
+        starlightFullViewMode({
+          leftSidebarEnabled: true,
+          rightSidebarEnabled: true
+        })
       ],
       head: [
         {

bun.lock

@@ -11,30 +11,30 @@
     "lint": "prettier --check '**/*.{js,mjs,ts,tsx,json,md,mdx,astro}' && eslint --max-warnings=0 ."
   },
   "dependencies": {
-    "@astrojs/mdx": "^4.3.13",
-    "@astrojs/node": "^9.5.2",
-    "@astrojs/starlight": "^0.37.4",
-    "@interledger/docs-design-system": "^0.11.0",
+    "@astrojs/mdx": "^5.0.3",
+    "@astrojs/node": "^10.0.5",
+    "@astrojs/starlight": "^0.38.3",
+    "@interledger/docs-design-system": "^0.12.0",
     "@types/showdown": "^2.0.6",
-    "astro": "^5.17.1",
+    "astro": "^6.1.8",
     "html-to-text": "^9.0.5",
-    "markdown-it": "^14.1.0",
-    "node-html-parser": "^7.0.2",
+    "markdown-it": "^14.1.1",
+    "node-html-parser": "^7.1.0",
     "sharp": "^0.34.5",
     "showdown": "^2.1.0",
     "starlight-fullview-mode": "^0.2.6",
-    "starlight-links-validator": "^0.19.1"
+    "starlight-links-validator": "^0.23.0"
   },
   "devDependencies": {
-    "@eslint/js": "^9.39.2",
-    "@typescript-eslint/parser": "^8.54.0",
-    "astro-eslint-parser": "^1.2.2",
-    "eslint": "^9.39.2",
+    "@eslint/js": "^10.0.1",
+    "@typescript-eslint/parser": "^8.59.0",
+    "astro-eslint-parser": "^1.4.0",
+    "eslint": "^10.2.1",
     "eslint-config-prettier": "^10.1.8",
-    "eslint-plugin-astro": "^1.5.0",
-    "globals": "^17.2.0",
-    "prettier": "3.8.1",
-    "prettier-plugin-astro": "0.14.1",
-    "typescript-eslint": "^8.54.0"
+    "eslint-plugin-astro": "^1.7.0",
+    "globals": "^17.5.0",
+    "prettier": "^3.8.3",
+    "prettier-plugin-astro": "^0.14.1",
+    "typescript-eslint": "^8.59.0"
   }
 }

package.json

@@ -1,4 +1,5 @@
-import { defineCollection, z } from 'astro:content'
+import { defineCollection } from 'astro:content'
+import { z } from 'astro/zod'
 import { docsLoader, i18nLoader } from '@astrojs/starlight/loaders'
 import { docsSchema, i18nSchema } from '@astrojs/starlight/schema'
 import { glob } from 'astro/loaders'