replace syscall with unix/windows packages where possible

[mmetc]

from the 1.22 release notes:

The syscall package has been frozen since Go 1.4 and was marked as deprecated in Go 1.11 [...] However, some non-deprecated functionality requires use of the syscall package [...] To avoid unnecessary complaints[...] no longer marked as deprecated. The package remains frozen to most new functionality, and new code remains encouraged to use golang.org/x/sys/unix or golang.org/x/sys/windows where possible.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 46.66667% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.94%. Comparing base (19d79a8) to head (d2bbb04).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/fsutil/getfstype_windows.go	0.00%	5 Missing ⚠️
.../acquisition/modules/wineventlog/config_windows.go	50.00%	2 Missing ⚠️
cmd/crowdsec/win_service.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3032      +/-   ##
==========================================
+ Coverage   62.92%   62.94%   +0.01%     
==========================================
  Files         467      467              
  Lines       33288    33298      +10     
==========================================
+ Hits        20948    20959      +11     
- Misses      10220    10221       +1     
+ Partials     2120     2118       -2     

Flag	Coverage Δ
bats	46.14% <50.00%> (-0.01%)	⬇️
unit-linux	35.73% <100.00%> (-0.02%)	⬇️
unit-windows	25.06% <38.46%> (+0.01%)	⬆️

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