Add .ConfigureAwait(false); to the await Task calls

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #704 (b08b842) into master (1d1ff4a) will increase coverage by 0.01%.
The diff coverage is 77.58%.

@@            Coverage Diff             @@
##           master     #704      +/-   ##
==========================================
+ Coverage   74.77%   74.79%   +0.01%     
==========================================
  Files         175      175              
  Lines        6296     6297       +1     
  Branches      647      647              
==========================================
+ Hits         4708     4710       +2     
  Misses       1385     1385              
+ Partials      203      202       -1     

Impacted Files	Coverage Δ
...Net/Authentication/AzureADAuthenticationMatcher.cs	24.13% <0.00%> (ø)
.../ResponseProviders/DynamicAsyncResponseProvider.cs	0.00% <0.00%> (ø)
src/WireMock.Net/Serialization/MappingConverter.cs	58.79% <ø> (ø)
...c/WireMock.Net/Server/WireMockServer.LogEntries.cs	40.47% <ø> (ø)
src/WireMock.Net/Transformers/Transformer.cs	92.12% <ø> (ø)
src/WireMock.Net/Util/EnhancedFileSystemWatcher.cs	0.00% <0.00%> (ø)
src/WireMock.Net/Serialization/MatcherMapper.cs	89.09% <50.00%> (ø)
...ock.Net/Server/WireMockServer.ImportWireMockOrg.cs	56.71% <50.00%> (ø)
src/WireMock.Net/Owin/WireMockMiddleware.cs	86.58% <71.42%> (ø)
src/WireMock.Net/Server/WireMockServer.Admin.cs	57.00% <71.42%> (ø)
... and 11 more

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