Update dependency paket to v6.1.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
paket (source)	nuget	minor	6.0.13 -> 6.1.3

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Release Notes

fsprojects/Paket

v6.1.3

Compare Source

• Added paket version to user-agent for nuget calls- add paket version to user-agent for nuget calls fsprojects/Paket#4087

v6.1.2

• Unified the setting of version + package metadata in the 461 and .net core builds of Paket - unify the setting of version + package metadata in the 461 and .net core builds of Paket fsprojects/Paket#4083

v6.1.0

Compare Source

• Use a different nuget extraction routine to extract to versioned folders - Use a different nuget extraction routine to extract to versioned folders fsprojects/Paket#4081
• Unified packaging strategy for Paket.Core - Unify packaging strategy for Paket.Core fsprojects/Paket#4080

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