Binder: Could not find a version that satisfies the requirement matplotlib==3.7.1

[ooker777]

Here is the log when running https://mybinder.org/v2/gh/jvns/pandas-cookbook/master:

Step 37/50 : COPY --chown=1000:1000 src/requirements.txt ${REPO_DIR}/requirements.txt
 ---> Using cache
 ---> 0ac1ed6a7c4e
Step 38/50 : USER ${NB_USER}
 ---> Using cache
 ---> 8c57bb10fbc0
Step 39/50 : RUN ${KERNEL_PYTHON_PREFIX}/bin/pip install --no-cache-dir -r "requirements.txt"
 ---> Running in 9479e21d4ccf
ERROR: Ignored the following versions that require a different python version: 3.6.0 Requires-Python >=3.8; 3.6.0rc1 Requires-Python >=3.8; 3.6.0rc2 Requires-Python >=3.8; 3.6.1 Requires-Python >=3.8; 3.6.2 Requires-Python >=3.8; 3.6.3 Requires-Python >=3.8; 3.7.0 Requires-Python >=3.8; 3.7.0rc1 Requires-Python >=3.8; 3.7.1 Requires-Python >=3.8
ERROR: Could not find a version that satisfies the requirement matplotlib==3.7.1 (from versions: 0.86, 0.86.1, 0.86.2, 0.91.0, 0.91.1, 1.0.1, 1.1.0, 1.1.1, 1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1rc1, 1.4.1, 1.4.2, 1.4.3, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 2.0.0b1, 2.0.0b2, 2.0.0b3, 2.0.0b4, 2.0.0rc1, 2.0.0rc2, 2.0.0, 2.0.1, 2.0.2, 2.1.0rc1, 2.1.0, 2.1.1, 2.1.2, 2.2.0rc1, 2.2.0, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 3.0.0rc2, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.1.0rc1, 3.1.0rc2, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.2.0rc1, 3.2.0rc3, 3.2.0, 3.2.1, 3.2.2, 3.3.0rc1, 3.3.0, 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.4.0rc1, 3.4.0rc2, 3.4.0rc3, 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.5.0b1, 3.5.0rc1, 3.5.0, 3.5.1, 3.5.2, 3.5.3)
ERROR: No matching distribution found for matplotlib==3.7.1
Removing intermediate container 9479e21d4ccf
The command '/bin/sh -c ${KERNEL_PYTHON_PREFIX}/bin/pip install --no-cache-dir -r "requirements.txt"' returned a non-zero code: 1

Why does this happen?