Bump xunit from 2.4.1 to 2.7.1 in /src

[dependabot[bot]]

Bumps xunit from 2.4.1 to 2.7.1.

Commits

• 62d5db6 v2.7.1
• e3c980f #2913: Assert.Equivalent behaves incorrectly with decimal values (v2)
• 57af1d9 Copy/paste error
• 9f97a28 #2503: Attempt to shield against exceptions which throw in their properties (v2)
• f69013b #2903: Add ArgumentFormatter aliases for nint and nuint (v2)
• e074b6a Copy missing assertion test change
• 3f1891d Unit tests for #2900 (v2)
• 9f7e7e7 Use separate projects for x86 builds instead of alternate configuration
• 4b2b9fa Add hidden overloads for binary compatibility for ConfigReader and friends
• c10b7a2 Fix for #2892: Timeout async guard inappropriately triggers with F# (v2)
• Additional commits viewable in compare view

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