chore(deps): update dependency richardszalay.mockhttp to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
RichardSzalay.MockHttp	6.0.0 → 7.0.0

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Release Notes

richardszalay/mockhttp (RichardSzalay.MockHttp)

v7.0.0

• Change target profiles to netstandard1.1, netstandard2.0, net5.0, net6.0 (BREAKING)
• Change default fallback behaviour to throw an exception with a report of the match attempts
• Add JSON and XML matchers
• Add support for synchronous HttpClient.Send #​104
• Modernize source #​41 and add SourceLink support #​66
• Fix matching of encoded URL paths #​116
• Throw a descriptive error when matching on a mocked request with no response #​87 (thanks perfectsquircle!)
• Fix race condition on outstanding requests exception message #​96 (thanks jr01!)

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