Fixing locale

[jkiddo]

This pull request updates the TimeoutManagerTest to improve locale-awareness in its logging tests. The most important changes include importing locale-related classes and modifying the test logic to dynamically handle the decimal separator based on the system's default locale.

Locale-awareness improvements:

• hapi-fhir-base/src/test/java/ca/uhn/fhir/util/TimeoutManagerTest.java: Added imports for DecimalFormatSymbols and Locale to support locale-specific formatting.
• checkTimeout_warningThreadholdHit_warningLogged: Updated the test to dynamically determine the decimal separator using DecimalFormatSymbols and the system's default locale. This ensures the test output is consistent with locale-specific formatting.

[robogary]

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[jkiddo]

@fil512 based on git history I'd say one is in your direction :)

[robogary]

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[robogary]

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