[Snyk] Security upgrade Microsoft.Owin from 4.0.0 to 4.1.1

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `nuget` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • src/WireMock.Net/WireMock.Net.csproj

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	696/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.5	Security Bypass SNYK-DOTNET-MICROSOFTOWIN-1019387	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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For more information:
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📚 Read more about Snyk's upgrade and patch logic

[codecov]

Codecov Report

Merging #686 (58c7dfa) into master (c333b8b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #686   +/-   ##
=======================================
  Coverage   74.27%   74.27%           
=======================================
  Files         148      148           
  Lines        6069     6069           
  Branches      645      645           
=======================================
  Hits         4508     4508           
  Misses       1356     1356           
  Partials      205      205           

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