Update Secret Detection Scanner, Gitleaks, to v5.0.1

Problem to solve

Gitleaks v5.0.1 has been released which includes two useful features that will help the secrets analyzer mature:

1. Line numbers on committed secrets
2. Scan additions only

This issue is 13.3 MR Coach work for @zrice.

Links / references

gitleaks v5.0.1 gitleaks v5.0.0

Implementation Plan

• Update Dockerfile to pull v5.0.1 of gitleaks
• Update unit tests
• Add line extraction to the analyzer