Blowfish has been deprecated

[Mavnus04]

Just running your example code and I get this at the end of the run:

C:\Program Files\Python37\lib\site-packages\paramiko\transport.py:219: CryptographyDeprecationWarning: Blowfish has been deprecated
  "class": algorithms.Blowfish,

Also, I had to add in the string library and strip off the ending newline cause the test was failing.

Execute Command And Verify Output
    [Documentation]    Execute Command can be used to run commands on the remote machine.
    ...                The keyword returns the standard output by default.
    ${output}=         Execute Command    echo ${myString}
    ${output} =  Strip String  ${output}
    Log To Console  ${output}
    Should Be Equal    ${output}  ${myString}

Python 3.7.9

Name: robotframework
Version: 5.0.1

Name: paramiko
Version: 2.7.2

Name: scp
Version: 0.14.5