Update nginx plus go client v3

[pdabelf5]

Proposed changes

• update nginx-plus-go-client to v3
• update prometheus-exporter to v1.5.0
• Correct reporting grace period

Checklist

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

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[vepatel]

# HELP nginx_ingress_nginxplus_license_expiration_timestamp_seconds License expiration date (expressed as Unix Epoch Time)
# TYPE nginx_ingress_nginxplus_license_expiration_timestamp_seconds gauge
nginx_ingress_nginxplus_license_expiration_timestamp_seconds{class="nginx"} X.XXXXXXXe+XX

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.66%. Comparing base (8973560) to head (9751428).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8223   +/-   ##
=======================================
  Coverage   53.65%   53.66%           
=======================================
  Files          91       91           
  Lines       22302    22305    +3     
=======================================
+ Hits        11967    11970    +3     
  Misses       9834     9834           
  Partials      501      501           

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