chore(deps): upgrade RestSharp, use builtin support for synchronous requests

[bednar]

Proposed Changes

1. Updated RestSharp to 108.0.2
2. Use builtin support for synchronous HTTP requests from RestSharp

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• dotnet test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Base: 87.52% // Head: 87.52% // No change to project coverage 👍

Coverage data is based on head (28dad07) compared to base (83fc2da).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #368   +/-   ##
=======================================
  Coverage   87.52%   87.52%           
=======================================
  Files          76       76           
  Lines        6638     6638           
=======================================
  Hits         5810     5810           
  Misses        828      828           

Impacted Files	Coverage Δ
Client.Core/Internal/RestSharpExtensions.cs	100.00% <100.00%> (ø)

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