feat: support Poetry

[SteveLauC]

Standards checklist:

• The PR title is descriptive.
• I have read CONTRIBUTING.md
• The code compiles (cargo build)
• The code passes rustfmt (cargo fmt)
• The code passes clippy (cargo clippy)
• The code passes tests (cargo test)
• Optional: I have tested the code myself

For new steps

• Optional: Topgrade skips this step where needed

• Optional: The --dry-run option works with this step

• Optional: The --yes option works with this step if it is supported by
  the underlying command

  cc @MisileLab, does this tool have something like $ poetry self update --yes?

If you developed a feature or a bug fix for someone else and you do not have the
means to test it, please tag this person here.

[SteveLauC]

Do you want a binary to test, I can give you a binary of the following platforms:

• Linux amd64 musl
• macOS aarch

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 4.26%. Comparing base (767f0d9) to head (169668f).

Files	Patch %	Lines
src/steps/generic.rs	0.00%	5 Missing ⚠️
src/main.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #790      +/-   ##
========================================
- Coverage   6.91%   4.26%   -2.65%     
========================================
  Files         37      33       -4     
  Lines      11645    5935    -5710     
========================================
- Hits         805     253     -552     
+ Misses     10840    5682    -5158     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[MisileLab]

Standards checklist:

* [x]  The PR title is descriptive.

* [x]  I have read `CONTRIBUTING.md`

* [x]  The code compiles (`cargo build`)

* [x]  The code passes rustfmt (`cargo fmt`)

* [x]  The code passes clippy (`cargo clippy`)

* [x]  The code passes tests (`cargo test`)

* [ ]  _Optional:_ I have tested the code myself

For new steps

* [x]  _Optional:_ Topgrade skips this step where needed

* [x]  _Optional:_ The `--dry-run` option works with this step

* [ ]  _Optional:_ The `--yes` option works with this step if it is supported by
  the underlying command
  cc @MisileLab, does this tool have something like `$ poetry self update --yes`?

If you developed a feature or a bug fix for someone else and you do not have the means to test it, please tag this person here.

I just see that checklist now, but I think poetry's update is non-interact, so it doesn't need yes option.

[SteveLauC]

Would you like to give this PR a test?