chore(deps): update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Setup Node.js environment
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version: "22.x"
 

.github/workflows/snyk-security.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 20