Fixed wrong ConfigureAwait usage.

[s-KaiNet]

The title is quite self-explanatory. ConfigureAwait(true) doesn't make sense, because it's default behaviour, in "library" projects we should always use ConfigureAwait(false). I believe true that was added by mistake.

[codecov-commenter]

Codecov Report

Merging #824 (8f02798) into dev (63545f3) will increase coverage by 1.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #824      +/-   ##
==========================================
+ Coverage   82.42%   83.45%   +1.03%     
==========================================
  Files         416      479      +63     
  Lines       28590    33354    +4764     
==========================================
+ Hits        23565    27837    +4272     
- Misses       5025     5517     +492     

Impacted Files	Coverage Δ
...re/Model/SharePoint/Changes/Internal/ChangeUser.cs	0.00% <0.00%> (-100.00%)	⬇️
...odel/Security/Internal/SharePointUserCollection.cs	78.78% <0.00%> (-21.22%)	⬇️
....Core/Exceptions/MicrosoftGraphServiceException.cs	80.00% <0.00%> (-20.00%)	⬇️
...PnP.Core.Admin/Model/Teams/Internal/TeamCreator.cs	76.19% <0.00%> (-14.29%)	⬇️
src/sdk/PnP.Core/Services/Core/TestManager.cs	54.94% <0.00%> (-12.96%)	⬇️
.../SharePoint/Core/Internal/ContentTypeCollection.cs	87.67% <0.00%> (-12.33%)	⬇️
...e/Model/Teams/Internal/TeamChannelTabCollection.cs	87.92% <0.00%> (-12.08%)	⬇️
.../Model/SharePoint/Core/Internal/ListItemVersion.cs	66.66% <0.00%> (-11.12%)	⬇️
...e/Model/SharePoint/Core/Internal/ListCollection.cs	82.12% <0.00%> (-9.09%)	⬇️
...P.Core/Services/Core/CSOM/Utils/CSOMFieldHelper.cs	80.61% <0.00%> (-7.81%)	⬇️
... and 143 more

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