chore: use lts node in CI

CI used node 18 which is ancient and doesn't support APIs required
by some build dependencies.

Author: dividedmind

.github/actions/setup-node/action.yml

@@ -6,7 +6,7 @@ runs:
     - name: Setup Node
       uses: actions/setup-node@v6
       with:
-        node-version: 18
+        node-version: lts/*
     - name: Detect Yarn cache dir
       id: yarn-cache-dir-path
       shell: bash

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: lts/*
 
       - name: Detect Yarn cache dir
         id: yarn-cache-dir-path