Updated stray Microsoft.Rest.ClientRuntime dependency

[tracyboehrer]

#minor

It doesn't appear this is even used, but is triggering alerts.

[coveralls]

Pull Request Test Coverage Report for Build 361082

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.006%) to 78.959%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/AdaptiveExpressions/LRUCache.cs	4	87.18%

Totals
Change from base Build 360595:	-0.006%
Covered Lines:	25938
Relevant Lines:	32850

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💛 - Coveralls