Merge pull request #1596 from FlowFuse/gh-action-node-v

Update node version that's used when running deploy-docs GH action

.github/workflows/deploy-docs.yml

@@ -19,7 +19,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-node@v4
         with:
-          node-version: 16
+          node-version: 18
           cache: npm
       - run: npm ci
       - name: Build