HYPERFLEET-1024 - chore: add checks:write permission and bump action versions

Add checks:write to CI job so stoplightio/spectral-action can post inline
PR annotations via GitHub API. Without this permission, the action fails
with "Resource not accessible by integration" even when linting passes.

Note: fork PRs cannot receive checks:write (GitHub security restriction)
so annotation posting will still fail there, but branch PRs on the real
repo will work correctly.

Bump actions/checkout and actions/setup-node from v4 to v6 (Node.js 24
runtime) ahead of the June 2nd, 2026 Node.js 20 forced deprecation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mliptak0

.github/workflows/ci.yml

@@ -11,13 +11,14 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: read
+      checks: write
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20'
 

.github/workflows/release.yml

@@ -13,12 +13,12 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20'