Add `--help-versions` option to miniconda component

[jwodder]

Closes #170.

[codecov-commenter]

Codecov Report

Attention: 49 lines in your changes are missing coverage. Please review.

Comparison is base (7d16a30) 64.63% compared to head (a875e47) 64.49%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #180 +/- ## ========================================== - Coverage 64.63% 64.49% -0.15% ========================================== Files 1 1 Lines 1513 1611 +98 Branches 346 374 +28 ========================================== + Hits 978 1039 +61 - Misses 438 470 +32 - Partials 97 102 +5 ``` | [Files](https://app.codecov.io/gh/datalad/datalad-installer/pull/180?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datalad) | Coverage Δ | | |---|---|---| | [src/datalad\_installer.py](https://app.codecov.io/gh/datalad/datalad-installer/pull/180?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datalad#diff-c3JjL2RhdGFsYWRfaW5zdGFsbGVyLnB5) | `64.49% <67.33%> (-0.15%)` | :arrow_down: |

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[yarikoptic]

looks and works great -- tested on "latest" - gave me one with python 3.11.5, and then on "py310_23.5.1-0" and got one with 3.10.12, cool, thank you!

[yarikoptic]

eh, was worth a release -- we should add a label to the next PR