Cannot install to Python 3.9

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

- [X] I checked the documentation.

### Issue

Installation of python-spams with python 3.9 fails, c.f.

```
$ conda install -c conda-forge python-spams
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: |
Found conflicts! Looking for incompatible packages.
This can take several minutes. Press CTRL-C to abort.
failed

UnsatisfiableError: The following specifications were found
to be incompatible with the existing python installation in your environment:

Specifications:

- python-spams -> python[version='2.7.*|3.5.*|3.6.*|>=2.7,<2.8.0a0|>=3.6,<3.7.0a0|>=3.8,<3.9.0a0|>=3.7,<3.8.0a0|>=3.5,<3.6.0a0']

Your python: python==3.9
```

### Installed packages

```shell
# Name Version Build Channel
_libgcc_mutex 0.1 main
_openmp_mutex 4.5 1_gnu
ca-certificates 2022.2.1 h06a4308_0
certifi 2021.10.8 py39h06a4308_2
ld_impl_linux-64 2.35.1 h7274673_9
libffi 3.3 he6710b0_2
libgcc-ng 9.3.0 h5101ec6_17
libgomp 9.3.0 h5101ec6_17
libstdcxx-ng 9.3.0 hd4cf53a_17
ncurses 6.3 h7f8727e_2
openssl 1.1.1m h7f8727e_0
pip 21.2.4 py39h06a4308_0
python 3.9.0 hdb3f193_2
readline 8.1.2 h7f8727e_1
setuptools 58.0.4 py39h06a4308_0
sqlite 3.38.0 hc218d9a_0
tk 8.6.11 h1ccaba5_0
tzdata 2021e hda174b7_0
wheel 0.37.1 pyhd3eb1b0_0
xz 5.2.5 h7b6447c_0
zlib 1.2.11 h7f8727e_4
```

### Environment info

```shell
active environment : test_spams39
active env location : /xxx/miniconda3/envs/test_spams39
shell level : 3
user config file : /yyy/.condarc
populated config files :
conda version : 4.11.0
conda-build version : not installed
python version : 3.9.5.final.0
virtual packages : __linux=5.13.0=0
__glibc=2.31=0
__unix=0=0
__archspec=1=x86_64
base environment : /xxx/miniconda3 (writable)
conda av data dir : /xxx/miniconda3/etc/conda
conda av metadata url : None
channel URLs : https://repo.anaconda.com/pkgs/main/linux-64
https://repo.anaconda.com/pkgs/main/noarch
https://repo.anaconda.com/pkgs/r/linux-64
https://repo.anaconda.com/pkgs/r/noarch
package cache : /xxx/miniconda3/pkgs
/yyy/.conda/pkgs
envs directories : /xxx/miniconda3/envs
/yyy/.conda/envs
platform : linux-64
user-agent : conda/4.11.0 requests/2.26.0 CPython/3.9.5 Linux/5.13.0-35-generic ubuntu/20.04.4 glibc/2.31
UID:GID : 1000:1000
netrc file : None
offline mode : False
```