Add plt close to integration test

[tobiaskleiner]

Fixes the following warning:

tests/integration_tests/test_ray_tracing.py::test_rx[3-5]
  /workdir/external/simtools/simtools/visualization/visualize.py:404: RuntimeWarning: More than 20 figures have been opened. Figures created through the pyplot interface (`matplotlib.pyplot.figure`) are retained until explicitly closed and may consume too much memory. (To control this warning, see the rcParam `figure.max_open_warning`). Consider using `matplotlib.pyplot.close()`.
    fig = plt.figure(figsize=(8, 6))

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

[ctao-dpps-sonarqube[bot]]

Analysis Details

0 Issues

• 0 Bugs
• 0 Vulnerabilities
• 0 Code Smells

Coverage and Duplications

• No coverage information (93.10% Estimated after merge)
• 0.00% Duplicated Code (0.00% Estimated after merge)

Project ID: gammasim_simtools_AY_ssha9WiFxsX-2oy_w

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