Test: Update emulator version from 31 to 33.

For all end-to-end tests, we currently run on a generic API 26 and newer API 31 emulator. Due to some issues on API 31, update to use an API 33 emulator.

Also, update documentation to mention issues on different emulator versions.

PiperOrigin-RevId: 509242743

testdata/src/test/assets/media/bitmap/README.md

@@ -14,7 +14,7 @@ To generate new "expected" assets:
     and can be run locally, using go/crow:
     and can be run locally, using go/crow:
 
 
     ```shell
     ```shell
-    crow --device generic_phone --api_level 31 --arch x86
+    crow --device generic_phone --api_level 33 --arch x86
     ```
     ```
 
 
 2.  Run the test.
 2.  Run the test.