Upgrade Playwright to 1.39.0

This requires us to now explicitly install the browsers (see [1]).

I’m doing this upgrade not because it’s necessary but because NPM tried
to make it for me when resolving a package-lock.json merge conflict in
an upcoming commit. Given that the upgrade involves this CI change,
thought it best to do it as a separate commit so it doesn’t get lost
inside a merge commit.

[1] https://playwright.dev/docs/release-notes#breaking-changes-playwright-no-longer-downloads-browsers-automatically

.github/workflows/test-browser.yml

@@ -25,8 +25,8 @@ jobs:
         with:
           node-version: 16.x
       - run: npm ci
-      - name: Install playwright dependencies
-        run: sudo npx playwright install-deps
+      - name: Install Playwright browsers and dependencies
+        run: npx playwright install --with-deps
       - env:
           PLAYWRIGHT_BROWSER: ${{ matrix.browser }}
         run: npm run test:playwright

package.json

@@ -81,7 +81,7 @@
     "minimist": "^1.2.5",
     "mocha": "^8.1.3",
     "null-loader": "^4.0.1",
-    "playwright": "^1.10.0",
+    "playwright": "^1.39.0",
     "prettier": "^2.5.1",
     "react": ">=18.1.0",
     "react-dom": ">=18.1.0",