fix(ci): align sundial-demo.yml action versions with SundialKit.yml

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

Author: leogdion

.github/workflows/sundial-demo.yml

@@ -62,10 +62,10 @@ jobs:
             download-platform: true
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Build and Test
-        uses: brightdigit/swift-build@v1.5.2
+        uses: brightdigit/swift-build@v1
         with:
           scheme: Sundial-Package
           type: ${{ matrix.type }}
@@ -84,7 +84,7 @@ jobs:
     env:
       LINT_MODE: STRICT
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: jdx/mise-action@v4
         with:
@@ -110,7 +110,7 @@ jobs:
     needs: [build-demo]
     if: ${{ !contains(github.event.head_commit.message, 'ci skip') }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: jdx/mise-action@v4
         with:
@@ -185,7 +185,7 @@ jobs:
       (github.ref == 'refs/heads/v2.0.0' || github.ref == 'refs/heads/main') &&
       !contains(github.event.head_commit.message, '[skip ci]')
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Download Pulse IPA
         uses: actions/download-artifact@v4