chore(deps): update dependency cpy-cli to v4

[mctavish]

This is a patched version of https://github.com/googleapis/cloud-debug-nodejs/pull/1057 to handle the fact that cpy-cli v4 removed the --parents flag.

[codecov[bot]]

Codecov Report

Merging #1091 (2152097) into main (92176b0) will decrease coverage by 0.45%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1091      +/-   ##
==========================================
- Coverage   65.79%   65.33%   -0.46%     
==========================================
  Files          21       21              
  Lines        1751     1751              
  Branches      352      352              
==========================================
- Hits         1152     1144       -8     
- Misses        512      515       +3     
- Partials       87       92       +5     

Impacted Files	Coverage Δ
src/agent/util/utils.ts	92.59% <0.00%> (-3.71%)	:arrow_down:
src/agent/state/inspector-state.ts	87.50% <0.00%> (-1.86%)	:arrow_down:
src/agent/v8/inspector-debugapi.ts	84.16% <0.00%> (-0.46%)	:arrow_down:

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[mctavish]

The issue appears to be that on Windows, cpy-cli copies the test files into the build directory as though --flat were specified, but the directory structure is preserved on other platforms.