Debugging: on Windows, try appending ssh (instead of prepending)

[DilumAluthge]

Let's see if this fixes the Windows failures we're seeing in #55.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.11%. Comparing base (df8111d) to head (91b54ec).

Files with missing lines	Patch %	Lines
src/git_function.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           dpa/openssh_jll      #61      +/-   ##
===================================================
- Coverage            96.96%   94.11%   -2.86%     
===================================================
  Files                    1        1              
  Lines                   33       34       +1     
===================================================
  Hits                    32       32              
- Misses                   1        2       +1     

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