Update dependency Stashbox to v2.6.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
Stashbox	nuget	minor	2.5.8 -> 2.6.5	source

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Release Notes

z4kn4fein/stashbox

v2.6.5

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• hotfix: Fix attribute reading on netcoreapp1.1 target

v2.6.4

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• bugfix: #​45 Member injection not working when there are different configurations registered for the same implementation
• bugfix: #​46 Fix for the failing aspnet/DI open generic tests

v2.6.3

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• Renamed: RegisterType(...) to Register(...)
• Added: SourceLink support

v2.6.1

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v2.6.1 issues
Fixed: Issue with Member Injection with Attribute but private setter #​43

v2.6.0

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v2.5.9

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v2.5.9 issues
Fixed: Circular dependency tracking doesn't work with factory resolution #​42

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