Bump actions/setup-node from 6 to 7 (#920)

Author: dependabot[bot]

.github/workflows/generate-mindmap.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
     - uses: actions/checkout@v7
     - name: Use Node.js
-      uses: actions/setup-node@v6
+      uses: actions/setup-node@v7
       with:
         node-version: 20
         cache: 'npm'

.github/workflows/markdownlint.yml

@@ -22,7 +22,7 @@ jobs:
     steps:
     - uses: actions/checkout@v7
     - name: Use Node.js
-      uses: actions/setup-node@v6
+      uses: actions/setup-node@v7
       with:
         node-version: 20
     - name: Run Markdownlint