Update dependency wikimedia/timestamp to v4.1.0

This MR contains the following updates:

Package	Type	Update	Change
wikimedia/timestamp (source)	require	minor	4.0.0 -> 4.1.0

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Release Notes

wikimedia/mediawiki-libs-Timestamp

v4.1.0

Compare Source

• Add add(), sub() methods for date interval arithmetic
• setFakeTime: add $step parameter
• Add microtime() function
• Fix documentation for ConvertibleTimestamp.php

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