deps: Bump node from 18 to 20 for docs

Author: matevz

.github/workflows/ci-lint.yml

@@ -34,10 +34,10 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.x'
-      - name: Set up Node.js 18
+      - name: Set up Node.js 20
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
       - name: Set up Go
         uses: actions/setup-go@v5
         with: