ci: run WebDriver tests on Chrome 140 for BiDi download events

Chrome 131 (selenium/standalone-chrome:4.27) never emits
browsingContext.downloadWillBegin, so seeFileDownloaded cannot detect
downloads there. Chrome 140 (4.35) does. Document the requirement.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: DavertMik

.github/workflows/webdriver.yml

@@ -26,7 +26,7 @@ jobs:
         node-version: [22.x]
 
     steps:
-      - run: docker run -d --net=host --shm-size=2g selenium/standalone-chrome:4.27
+      - run: docker run -d --net=host --shm-size=2g selenium/standalone-chrome:4.35
       - uses: actions/checkout@v6
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v6

lib/helper/WebDriver.js

@@ -2216,7 +2216,8 @@ class WebDriver extends Helper {
   /**
    * {{> seeFileDownloaded }}
    *
-   * Requires `bidiProtocol` enabled. Files are saved by the browser into its own download directory.
+   * Requires `bidiProtocol` enabled and a browser that emits BiDi `browsingContext.downloadWillBegin` (verified on Chrome 140; Chrome 131 does not emit it).
+   * Files are saved by the browser into its own download directory.
    */
   async seeFileDownloaded(fileName, sec = null) {
     const waitTimeout = sec ? sec * 1000 : this.options.waitForTimeout