Bump SSH.NET from 2016.1.0 to 2020.0.2 in /NSF2SQL

Bumps [SSH.NET](https://github.com/sshnet/SSH.NET) from 2016.1.0 to 2020.0.2.
- [Release notes](https://github.com/sshnet/SSH.NET/releases)
- [Commits](sshnet/SSH.NET@2016.1.0...2020.0.2)

---
updated-dependencies:
- dependency-name: SSH.NET
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

NSF2SQL/packages.config

@@ -7,7 +7,7 @@
   <package id="K4os.Compression.LZ4.Streams" version="1.2.6" targetFramework="net472" />
   <package id="K4os.Hash.xxHash" version="1.0.8" targetFramework="net472" />
   <package id="MySql.Data" version="8.1.0" targetFramework="net472" />
-  <package id="SSH.NET" version="2016.1.0" targetFramework="net472" />
+  <package id="SSH.NET" version="2020.0.2" targetFramework="net472" />
   <package id="System.Buffers" version="4.5.1" targetFramework="net472" />
   <package id="System.Memory" version="4.5.4" targetFramework="net472" />
   <package id="System.Numerics.Vectors" version="4.5.0" targetFramework="net472" />