Update DEPS to use Chrome 132.0.6834.15 and Firefox 133.0 (build 2)

These are the latest beta and stable versions, respectively.

Change-Id: Ib3baddee05428077414676dcbb326c31ebd86fce
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/397600
Reviewed-by: Nate Biggs <[email protected]>
Commit-Queue: Srujan Gaddam <[email protected]>

DEPS

@@ -184,9 +184,9 @@ vars = {
   # meant to be downloaded by users for local testing. You can self-service
   # update these by following the go/dart-engprod/browsers.md instructions.
   "download_chrome": False,
-  "chrome_tag": "132.0.6834.6",
+  "chrome_tag": "132.0.6834.15",
   "download_firefox": False,
-  "firefox_tag": "132.0",
+  "firefox_tag": "133.0",
 
   # Emscripten is used in dart2wasm tests.
   "download_emscripten": False,