[Snyk] Security upgrade ServiceStack.Text from 3.9.71 to 8.6.0

[sasnyk-hudl]

Snyk has created this PR to fix 2 vulnerabilities in the nuget dependencies of this project.

Snyk changed the following file(s):

• Hudl.StackDriver.PerfMon/packages.config

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Deserialization of Untrusted Data SNYK-DOTNET-SERVICESTACKTEXT-10500472	674
	External Control of File Name or Path SNYK-DOTNET-SERVICESTACKTEXT-10500474	624

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[sasnyk-hudl]

⛔ Snyk checks have failed. 2 issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (2)
⛔	Open Source Security	0	2	0	0	2 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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