Update dependency qunit to v2.21.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
qunit (source)	2.19.4 -> 2.21.1

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Release Notes

qunitjs/qunit (qunit)

v2.21.1

Compare Source

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Deprecated

• Assert: Add notice about upcoming change in how assert.expect() counts steps for assert.verifySteps(). #​1226

Fixed

• Core: Fix missing second frame in QUnit.stack() in Safari. #​1776
• Core: Fix stacktrace cleaner to support URLs with host ports. #​1769
• HTML Reporter: Fix reversed order after clicking "Hide passed". #​1763
• HTML Reporter: Fix encoding of label for urlConfig multi-value item.

v2.21.0

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Added

• Assert: Add assert.closeTo(). (Timo Tijhof) #​1735
• Core: Add support for flat preconfig via environment/global variables. (Timo Tijhof)

Deprecated

• Core: Deprecate QUnit.load() and document migration path at https://qunitjs.com/api/QUnit/load/. (Timo Tijhof) #​1743
• Core: Deprecate unset testTimeout for tests taking longer than 3 seconds. (Timo Tijhof) #​1483

v2.20.1

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Fixed

• Core: Fix compatibility with sinon.useFakeTimers in IE 10 and IE 11. (Timmy Willison) #​1738
• Core: Fix hanging assert.async() after assert.timeout(). (Timo Tijhof) #​1705

v2.20.0

Compare Source

==================

Added

• Core: Add QUnit.reporters.perf. (Timo Tijhof) #​1714

Changed

• Assert: Add type check for assert.async() parameter. (Zixin Yin) #​1721
• HTML Reporter: Remove units for 0 values in qunit.css. (Hareesh) #​1715

Fixed

• Core: Faster inArray by using Array.prototype.includes when possible. (Izel Nakri)

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