conda prefers pypy3.8 over CPython 3.8 on aarch64 by default?

### Solution to issue cannot be found in the documentation.

- [X] I checked the documentation.

### Issue

It seems pypy instead of CPython is the default, despite `pypy` is not asked for:
```
$ conda create -n my_env python=3.8
Collecting package metadata (current_repodata.json): done
Solving environment: done

==> WARNING: A newer version of conda exists. <==
current version: 23.3.1
latest version: 23.5.0

Please update conda by running

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

Or to minimize the number of packages updated during conda update use

conda install conda=23.5.0

## Package Plan ##

...

The following NEW packages will be INSTALLED:

_openmp_mutex conda-forge/linux-aarch64::_openmp_mutex-4.5-2_gnu
bzip2 conda-forge/linux-aarch64::bzip2-1.0.8-hf897c2e_4
ca-certificates conda-forge/linux-aarch64::ca-certificates-2023.5.7-hcefe29a_0
expat conda-forge/linux-aarch64::expat-2.5.0-hd600fc2_1
gdbm conda-forge/linux-aarch64::gdbm-1.18-h0a1914f_2
libexpat conda-forge/linux-aarch64::libexpat-2.5.0-hd600fc2_1
libffi conda-forge/linux-aarch64::libffi-3.4.2-h3557bc0_5
libgcc-ng conda-forge/linux-aarch64::libgcc-ng-13.1.0-h2b4548d_0
libgomp conda-forge/linux-aarch64::libgomp-13.1.0-h2b4548d_0
libsqlite conda-forge/linux-aarch64::libsqlite-3.42.0-h194ca79_0
libzlib conda-forge/linux-aarch64::libzlib-1.2.13-h31becfc_5
ncurses conda-forge/linux-aarch64::ncurses-6.4-h2e1726e_0
openssl conda-forge/linux-aarch64::openssl-3.1.1-h31becfc_1
pip conda-forge/noarch::pip-23.1.2-pyhd8ed1ab_0
pypy3.8 conda-forge/linux-aarch64::pypy3.8-7.3.11-hf9a8208_0
python conda-forge/linux-aarch64::python-3.8.16-0_73_pypy
python_abi conda-forge/linux-aarch64::python_abi-3.8-3_pypy38_pp73
readline conda-forge/linux-aarch64::readline-8.2-h8fc344f_1
setuptools conda-forge/noarch::setuptools-67.7.2-pyhd8ed1ab_0
sqlite conda-forge/linux-aarch64::sqlite-3.42.0-h3b3482f_0
tk conda-forge/linux-aarch64::tk-8.6.12-hd8af866_0
wheel conda-forge/noarch::wheel-0.40.0-pyhd8ed1ab_0
xz conda-forge/linux-aarch64::xz-5.2.6-h9cdd2b7_0
zlib conda-forge/linux-aarch64::zlib-1.2.13-h31becfc_5

Proceed ([y]/n)?
```

### Installed packages

```shell
n/a
```

### Environment info

```shell
$ conda info

active environment : base
active env location : **********
shell level : 1
user config file : **********
populated config files : **********
conda version : 23.3.1
conda-build version : not installed
python version : 3.10.10.final.0
virtual packages : __archspec=1=aarch64
__cuda=12.0=0
__glibc=2.31=0
__linux=5.4.0=0
__unix=0=0
base environment : ********** (writable)
conda av data dir : **********
conda av metadata url : None
channel URLs : https://conda.anaconda.org/conda-forge/linux-aarch64
https://conda.anaconda.org/conda-forge/noarch
package cache : **********
**********
envs directories : **********
**********
platform : linux-aarch64
user-agent : conda/23.3.1 requests/2.28.2 CPython/3.10.10 Linux/5.4.0-150-generic ubuntu/20.04.6 glibc/2.31
UID:GID : 43505:30
netrc file : None
offline mode : False
```