slabtop: add license header to test

[cakebaker]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.10%. Comparing base (8b447f1) to head (c0386f1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #68       +/-   ##
==========================================
- Coverage   49.15%   0.10%   -49.05%     
==========================================
  Files          18      18               
  Lines        2199    1830      -369     
  Branches      310     239       -71     
==========================================
- Hits         1081       2     -1079     
- Misses       1079    1827      +748     
+ Partials       39       1       -38     

Flag	Coverage Δ
macos_latest	?
ubuntu_latest	?
windows_latest	0.10% <ø> (-0.01%)	⬇️

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