Upgrade GitHub Actions for Node 24 compatibility

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

.github/workflows/security-scan.yml

@@ -14,9 +14,9 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version-file: backend/go.mod
           check-latest: false
@@ -33,13 +33,13 @@ jobs:
   frontend-security:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up pnpm
         uses: pnpm/action-setup@v4
         with:
           version: 9
       - name: Set up Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20'
           cache: 'pnpm'