Update actions/checkout to v6 and set env

Add FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true to both .github/workflows/ci.yml and .github/workflows/mdbook.yml to force JS actions to run on Node 24. Also bump actions/checkout from v4 to v6 in both workflows to use the updated checkout action for improved compatibility and fixes.

Author: mohamadzoh

.github/workflows/ci.yml

@@ -6,6 +6,9 @@ on:
       - master
   pull_request:
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
+
 jobs:
   test:
     runs-on: ubuntu-latest
@@ -19,7 +22,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
@@ -38,7 +41,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install mdBook
         uses: taiki-e/install-action@mdbook

.github/workflows/mdbook.yml

@@ -12,6 +12,9 @@ on:
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
+
 # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
 permissions:
   contents: read
@@ -31,7 +34,7 @@ jobs:
     env:
       MDBOOK_VERSION: 0.4.36
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install mdBook
         run: |
           curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf -y | sh