Update GitHub Actions to latest versions

- Updated actions/checkout from v3 to v4
- Updated actions/setup-node from v3 to v4
- Updated actions/upload-artifact from v3 to v4

These changes should fix the 'Missing download info' errors in workflows.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: robtaylor

.github/workflows/tutorial-comprehension-test.yml

@@ -20,10 +20,10 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: '18'
 
@@ -109,7 +109,7 @@ jobs:
         run: node analyze_tutorial.js
 
       - name: Archive analysis results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: tutorial-analysis
           path: tutorial_analysis.md

.github/workflows/tutorial-execution-test.yml

@@ -22,10 +22,10 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python and Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: '18'
 
@@ -242,7 +242,7 @@ jobs:
         run: node execute_tutorial.js
 
       - name: Archive execution results
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: tutorial-execution-results
           path: |

.github/workflows/tutorial-test.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Check tutorial refers to existing files
         run: |
@@ -48,7 +48,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4
@@ -134,7 +134,7 @@ jobs:
           exit $EXIT_CODE
 
       - name: Archive generated files
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: tutorial-outputs
           path: |