[build-bot] Correctly match hex in ignore pattern for flaky Windows cross-builds

Summary:
It turns out all of those numbers patterns are hex and not decimals.
Example: https://build.bitcoinabc.org/viewLog.html?buildId=104262&buildTypeId=BitcoinABC_ResourceIntensiveBuilds_BitcoinAbcCrossBuildWindows64bit&tab=buildLog&_focus=2419
The test log has been updated with this example.

Test Plan: pytest

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8029