Update electron to 15.3.0

.github/workflows/benchmark.yml

@@ -25,13 +25,13 @@ jobs:
       with:
         repository: 'signalapp/Mock-Signal-Server-Private'
         path: 'Mock-Server'
-        ref: 'alpha'
+        ref: 'beta'
         token: ${{ secrets.AUTOMATED_GITHUB_PAT }}
 
     - name: Setup node.js
       uses: actions/setup-node@v2
       with:
-        node-version: '14.16.0'
+        node-version: '16.5.0'
     - name: Install global dependencies
       run: npm install -g yarn@1.22.10 typescript@4.4.2 ts-node@10.2.1
 
@@ -52,6 +52,8 @@ jobs:
     - name: Install Mock-Server node_modules
       run: yarn install --frozen-lockfile
       working-directory: Mock-Server
+      env:
+        PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: 1
 
     - name: Build typescript
       run: yarn grunt