Bump opencv-python from 3.4.3.18 to 3.4.7.28 in /pneumoRL#9

Bumps [opencv-python](https://github.com/skvark/opencv-python) from 3.4.3.18 to 3.4.7.28. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/skvark/opencv-python/releases">opencv-python's releases</a>.</em></p> <blockquote> <h2>3.4.7.28</h2> <p>OpenCV version 3.4.7.</p> <h2>3.4.6.27</h2> <p>OpenCV version 3.4.6.</p> <h2>3.4.5.20</h2> <p>OpenCV version 3.4.5.</p> <p>Once some build issues are solved, next releases will be targeting OpenCV version 4.</p> <ul> <li>opencv-python: <a href="https://pypi.org/project/opencv-python/">https://pypi.org/project/opencv-python/</a></li> <li>opencv-contrib-python: <a href="https://pypi.org/project/opencv-contrib-python/">https://pypi.org/project/opencv-contrib-python/</a></li> <li>opencv-python-headless: <a href="https://pypi.org/project/opencv-python-headless/">https://pypi.org/project/opencv-python-headless/</a></li> <li>opencv-contrib-python-headless: <a href="https://pypi.org/project/opencv-contrib-python-headless/">https://pypi.org/project/opencv-contrib-python-headless/</a></li> </ul> <h2>3.4.4.19</h2> <ul> <li>opencv-python: <a href="https://pypi.org/project/opencv-python/">https://pypi.org/project/opencv-python/</a></li> <li>opencv-contrib-python: <a href="https://pypi.org/project/opencv-contrib-python/">https://pypi.org/project/opencv-contrib-python/</a></li> <li>opencv-python-headless: <a href="https://pypi.org/project/opencv-python-headless/">https://pypi.org/project/opencv-python-headless/</a></li> <li>opencv-contrib-python-headless: <a href="https://pypi.org/project/opencv-contrib-python-headless/">https://pypi.org/project/opencv-contrib-python-headless/</a></li> </ul> <p>OpenCV version 3.4.4.</p> <p>Thanks to Ivan Pozdeev for following fixes and enhancements: <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/135">#135</a>, <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/136">#136</a>, <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/141">#141</a>, <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/144">#144</a>, <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/145">#145</a>, <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/146">#146</a>, <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/147">#147</a>, <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/149">#149</a>, <a href="https://github-redirect.dependabot.com/skvark/opencv-python/issues/150">#150</a></p> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li>See full diff in <a href="https://github.com/skvark/opencv-python/commits">compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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