readthedocs build failure

[bendnorman]

Our readthedocs builds are failing because of a confusing dependency conflict. Full error:

warning  libmamba Could not parse mod/etag header
warning  libmamba Could not parse mod/etag header
Could not solve for environment specs
The following packages are incompatible
├─ cryptography ==44.0.0 py312hda17c39_0 is requested and can be installed;
└─ pyopenssl ==21.0.0 pyhd8ed1ab_0 is not installable because it requires
   └─ cryptography >=3.3,<39.0a0 , which conflicts with any installable versions previously reported.

• Logs from the most recent successful build
• Logs from the build failure

I'm confused because the conda-linux-64.lock.yml in the successful and failed builds both use cryptography ==44.0.0 and pyopenssl ==21.0.0. The mamba versions are also the same.

I tried adding cryptography<39.0a0 to pyproject.toml but got a slew of other dependency issues.

[bendnorman]

Resolved by #3989