Update width of style demo figures

[A-CGray]

Purpose

One of the labels in the doumont style demos was intersecting with the y axis, so I made the axes wider.

Before:

After:

For some reason this is only an issue on the website, not when you run the examples locally.

I also updated the versions of python, numpy, and matplotlib that we test with.

Expected time until merged

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[marcomangano]

For some reason a test is failing because matplotlib is forcing the install of numpy 2, despite numpy==1.23.* being installed right before satisfies the matplotlib 3.6 dependencies constraints (wants numpy >= 1.19)

Successfully installed numpy-1.23.5
Collecting matplotlib==3.6.*
  Downloading matplotlib-3.6.3-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.metadata (6.8 kB)
Collecting contourpy>=1.0.1 (from matplotlib==3.6.*)
  Downloading contourpy-1.3.3-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl.metadata (5.5 kB)
Collecting cycler>=0.10 (from matplotlib==3.6.*)
  Downloading cycler-0.12.1-py3-none-any.whl.metadata (3.8 kB)
Collecting fonttools>=4.22.0 (from matplotlib==3.6.*)
  Downloading fonttools-4.59.1-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.whl.metadata (108 kB)
Collecting kiwisolver>=1.0.1 (from matplotlib==3.6.*)
  Downloading kiwisolver-1.4.9-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.whl.metadata (6.3 kB)
**Requirement already satisfied: numpy>=1.19** in /opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/site-packages (from matplotlib==3.6.*) (1.23.5)
Collecting packaging>=20.0 (from matplotlib==3.6.*)
  Downloading packaging-25.0-py3-none-any.whl.metadata (3.3 kB)
Collecting pillow>=6.2.0 (from matplotlib==3.6.*)
  Downloading pillow-11.3.0-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl.metadata (9.0 kB)
Collecting pyparsing>=2.2.1 (from matplotlib==3.6.*)
  Downloading pyparsing-3.2.3-py3-none-any.whl.metadata (5.0 kB)
Collecting python-dateutil>=2.7 (from matplotlib==3.6.*)
  Downloading python_dateutil-2.9.0.post0-py2.py3-none-any.whl.metadata (8.4 kB)
**Collecting numpy>=1.19 (from matplotlib==3.6.*)
  Downloading numpy-2.3.2-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl.metadata (62 kB)**

[A-CGray]

bump @marcomangano