Update dependency Verify.NUnit to 31.21.0 - autoclosed

[dependencyupdates]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Verify.NUnit	31.20.0 → 31.21.0

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Release Notes

VerifyTests/Verify (Verify.NUnit)

v31.21.0

Compare Source

• #​1656 throw for greedy RegisterFileConverter
• #​1762 Reject carriage returns in verified files instead of normalizing
• #​1767 Fix correctness and perf issues in compare, recording, naming and checks
• #​1768 Fix VerifySettings copy constructor, temp cleanup, and stream/extensi…
• #​1769 Fix combination runner/converter, Expecto directory verification, and…
• #​1770 Fix serialization scrub/convert bugs and reduce per-value scrubbing allocations
• #​1771 Fix verifier cleanup composition, stream/xml disposal and comparison
• #​1772 Bump Argon from 0.34.0 to 0.35.0
• #​1773 Bump DiffEngine from 19.2.0 to 19.3.0
• #​1774 Clear synchronization context in to task()
• #​1775 Throw for greedy RegisterFileConverter

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