Add miniforge3 and mambaforge 22.9.0-2

[smcgivern]

These are available, but only as the latest (rolling) version, thanks to #2019. However, it's also useful to be able to get these more recent versions specifically, so we can pin them.

I am not sure how to comprehensively test this, but it works on my machine 😃

$ bin/pyenv install miniforge3-22.9.0-2
Downloading Miniforge3-22.9.0-2-Linux-x86_64.sh.sh...
-> https://github.com/conda-forge/miniforge/releases/download/22.9.0-2/Miniforge3-22.9.0-2-Linux-x86_64.sh
Installing Miniforge3-22.9.0-2-Linux-x86_64.sh...
Collecting package metadata (current_repodata.json): done
Solving environment: done


==> WARNING: A newer version of conda exists. <==
  current version: 22.9.0
  latest version: 22.11.1

Please update conda by running

    $ conda update -n base -c conda-forge conda



## Package Plan ##

  environment location: /home/smcgivern/.pyenv/versions/miniforge3-22.9.0-2

  added / updated specs:
    - conda=22.9.0
    - pip


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    ca-certificates-2022.12.7  |       ha878542_0         143 KB  conda-forge
    certifi-2022.12.7          |     pyhd8ed1ab_0         147 KB  conda-forge
    openssl-3.0.7              |       h0b41bf4_1         2.5 MB  conda-forge
    ------------------------------------------------------------
                                           Total:         2.8 MB

The following packages will be UPDATED:

  ca-certificates                      2022.9.24-ha878542_0 --> 2022.12.7-ha878542_0 None
  certifi                            2022.9.24-pyhd8ed1ab_0 --> 2022.12.7-pyhd8ed1ab_0 None
  openssl                                  3.0.7-h166bdaf_0 --> 3.0.7-h0b41bf4_1 None



Downloading and Extracting Packages
ca-certificates-2022 | 143 KB    | : 100% 1.0/1 [00:00<00:00,  2.99it/s]
certifi-2022.12.7    | 147 KB    | : 100% 1.0/1 [00:00<00:00,  4.97it/s]
openssl-3.0.7        | 2.5 MB    | : 100% 1.0/1 [00:00<00:00,  1.78it/s]
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
Retrieving notices: ...working... done
Installed Miniforge3-22.9.0-2-Linux-x86_64.sh to /home/smcgivern/.pyenv/versions/miniforge3-22.9.0-2

$ bin/pyenv local miniforge3-22.9.0-2
$ python3 -V
Python 3.10.6
$ bin/pyenv which python3
/home/smcgivern/.pyenv/versions/miniforge3-22.9.0-2/bin/python3

I also have a script similar to https://github.com/pyenv/pyenv/blob/master/plugins/python-build/scripts/add_miniconda.py that I used to add this. I can submit that in a separate PR if needed.

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