[Snyk] Security upgrade Newtonsoft.Json from 11.0.2 to 13.0.1

[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
	768/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.5	Insecure Defaults SNYK-DOTNET-NEWTONSOFTJSON-2774678	Yes	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

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[codecov]

Codecov Report

Merging #750 (9441de7) into master (a6ee2da) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #750   +/-   ##
=======================================
  Coverage   75.66%   75.66%           
=======================================
  Files         189      189           
  Lines        6566     6566           
  Branches      675      675           
=======================================
  Hits         4968     4968           
  Misses       1388     1388           
  Partials      210      210           

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