Chore: Actions updates and cleanup (#8377)

## Summary

...

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8377-WIP-Chore-Actions-updates-and-cleanup-2f66d73d3650818483a8dffa32a6f245)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>

.github/actions/setup-frontend/action.yaml

@@ -12,29 +12,17 @@ runs:
 
     # Install pnpm, Node.js, build frontend
     - name: Install pnpm
-      uses: pnpm/action-setup@v4
+      uses: pnpm/action-setup@41ff72655975bd51cab0327fa583b6e92b6d3061 # v4.2.0
       with:
         version: 10
 
     - name: Setup Node.js
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version: 'lts/*'
         cache: 'pnpm'
         cache-dependency-path: './pnpm-lock.yaml'
 
-    # Restore tool caches before running any build/lint operations
-    - name: Restore tool output cache
-      uses: actions/cache/restore@v4
-      with:
-        path: |
-          ./.cache
-          ./tsconfig.tsbuildinfo
-        key: tool-cache-${{ runner.os }}-${{ hashFiles('./pnpm-lock.yaml') }}-${{ hashFiles('./src/**/*.{ts,vue,js,mts}', './*.config.*') }}
-        restore-keys: |
-          tool-cache-${{ runner.os }}-${{ hashFiles('./pnpm-lock.yaml') }}-
-          tool-cache-${{ runner.os }}-
-
     - name: Install dependencies
       shell: bash
       run: pnpm install --frozen-lockfile