Linux web_benchmarks_skwasm_st is 5.05% flaky #190989

The post-submit test builder Linux web_benchmarks_skwasm_st had a flaky ratio 5.05% for the past (up to) 100 commits, which is above our 2.00% threshold.

One recent flaky example for a same commit: https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20web_benchmarks_skwasm_st/9524
Commit: f6d405c

Flaky builds:
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20web_benchmarks_skwasm_st/9524
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20web_benchmarks_skwasm_st/9514
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20web_benchmarks_skwasm_st/9511
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20web_benchmarks_skwasm_st/9509
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20web_benchmarks_skwasm_st/9485

Recent test runs:
https://flutter-dashboard.appspot.com/#/build?taskFilter=Linux%20web_benchmarks_skwasm_st

Please follow https://github.com/flutter/flutter/blob/master/docs/infra/Reducing-Test-Flakiness.md#fixing-flaky-tests to fix the flakiness and enable the test back after validating the fix (internal dashboard to validate: go/flutter_test_flakiness).