vuln: update dependencies to remove unsafe generator package

[brandon-at-wrk]

Hi maintainers! I'm Brandon and I work at Bison Trails. We're doing an internal hackathon this week focused on security.

Our team loves kubie, but it got flagged during a recent security review. Our team voted to use our hackathon time to patch vulnerabilities in our favorite OSS tools and specifically to try to get kubie approved for usage within our organization.

What's here:

• Update dependencies in Cargo.lock to fix RUSTSEC-2020-0151
  • Removes the generator sub-dependency which contained a memory-security vulnerability.

Impact:

These changes should improve kubie's security posture. We identified these vulnerabilities using Salus and the OSSF scorecard.

Thank you so much for your work maintaining kubie, and thank you for taking the time to look at these proposed changes!

[sbstp]

Thanks!