Change how the dummy program is vendored

[UnstoppableMango]

Should allow renovate to operate with less manual intervention

[codecov]

Codecov Report

Attention: Patch coverage is 34.83146% with 58 lines in your changes are missing coverage. Please review.

Project coverage is 28.19%. Comparing base (c17a336) to head (ce83811).

❗ Current head ce83811 differs from pull request most recent head 0dced79

Please upload reports for the commit 0dced79 to get more accurate results.

Files	Patch %	Lines
...liWrap.Tests.Dummy/Commands/GenerateTextCommand.cs	0.00%	13 Missing ⚠️
...c/CliWrap.Tests.Dummy/Commands/EchoStdInCommand.cs	0.00%	12 Missing ⚠️
src/CliWrap.Tests.Dummy/Commands/SleepCommand.cs	0.00%	9 Missing ⚠️
...CliWrap.Tests.Dummy/Commands/LengthStdInCommand.cs	0.00%	8 Missing ⚠️
src/CliWrap.Tests.Dummy/Commands/EchoCommand.cs	0.00%	6 Missing ⚠️
...CliWrap.Tests.Dummy/Commands/EnvironmentCommand.cs	0.00%	4 Missing ⚠️
src/CliWrap.Tests.Dummy/Commands/ExitCommand.cs	0.00%	4 Missing ⚠️
...ap.Tests.Dummy/Commands/WorkingDirectoryCommand.cs	0.00%	1 Missing ⚠️
src/CliWrap.Tests.Dummy/Program.cs	92.85%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   22.22%   28.19%   +5.96%     
==========================================
  Files           4       15      +11     
  Lines          99      188      +89     
  Branches        0       15      +15     
==========================================
+ Hits           22       53      +31     
- Misses         77      134      +57     
- Partials        0        1       +1     

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[UnstoppableMango]

Not sure why I'm struggling so hard with this