ci: install pnpm and Node with pnpm/setup

Author: ariesclark

.github/workflows/build.yaml

@@ -24,15 +24,9 @@ jobs:
 
       - uses: vrchatapi/specification/.github/actions/download@ci/modernise-actions
 
-      - uses: pnpm/action-setup@v6
+      - uses: pnpm/setup@v2
         with:
-          run_install: false
-
-      - uses: actions/setup-node@v7
-        with:
-          node-version: 24
-          cache: pnpm
-
-      - run: pnpm install
+          runtime: node@24
+          cache: true
 
       - run: pnpm build