call underlying os.Hostname instead of the entire hostInfo gopsutil call

[oliveromahony]

Proposed changes

Reduces the allocs per operation from 271 to 1 for GetHostname call

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.09% 🎉

Comparison is base (4747879) 66.29% compared to head (d88b7d8) 66.39%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #479      +/-   ##
==========================================
+ Coverage   66.29%   66.39%   +0.09%     
==========================================
  Files         118      118              
  Lines       13391    13389       -2     
==========================================
+ Hits         8877     8889      +12     
+ Misses       3924     3910      -14     
  Partials      590      590              

Files Changed	Coverage Δ
src/core/environment.go	52.52% <0.00%> (+0.16%)	⬆️

... and 3 files with indirect coverage changes

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