rust: fix inherent to string

[TheKharleeci]

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Link to redmine ticket:
https://redmine.openinfosecfoundation.org/issues/4618

Ticket: #4618
Prev-PR: #6516

Describe changes:

• ntlmssp_records:-Add fix to inherent_to_string warning
• Remove #!allow(clippy::inherent_to_string) clippy lint from rust/src/lib.rs

[codecov]

Codecov Report

Merging #6547 (a5b260d) into master (416575e) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6547      +/-   ##
==========================================
- Coverage   77.14%   77.06%   -0.08%     
==========================================
  Files         613      613              
  Lines      186735   186750      +15     
==========================================
- Hits       144052   143922     -130     
- Misses      42683    42828     +145     

Flag	Coverage Δ
fuzzcorpus	52.96% <ø> (-0.06%)	⬇️
suricata-verify	52.08% <ø> (-0.07%)	⬇️
unittests	63.11% <ø> (-0.01%)	⬇️

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[victorjulien]

Merged as part of #6552, thanks!