Replace OpenCV version string comparison with semver. (backport #1087)

[mergify]

When using the ChArUco markers with cameracalibrator, I found out that there's an issue with the last versions of OpenCV due to the fact that versions are compared as strings and the thing goes wrong for versions 4.10 and above e.g.:

>>> '4.7.0' >= '4.8.0'
False
>>> '4.8.0' >= '4.8.0'
True
>>> '4.9.0' >= '4.8.0'
True
>>> '4.10.0' >= '4.8.0'
False
>>> '4.11.0' >= '4.8.0'
False

I fixed the behavior by using semver library which is already used in the package e.g.:

>>> VersionInfo.parse('4.7.0') >= VersionInfo.parse('4.8.0')
False
>>> VersionInfo.parse('4.8.0') >= VersionInfo.parse('4.8.0')
True
>>> VersionInfo.parse('4.9.0') >= VersionInfo.parse('4.8.0')
True
>>> VersionInfo.parse('4.10.0') >= VersionInfo.parse('4.8.0')
True
>>> VersionInfo.parse('4.11.0') >= VersionInfo.parse('4.8.0')
True

Hope this fix helps anyone else too despite the fact that documentation/tutorials are skipping to mention the ChArUcos as a possible pattern (like here). In my experience, ChArUcos give better results than classic chessboards.

Also a question: does anyone mind if I cherry-pick this fix here along with mine above also to the humble?

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This is an automatic backport of pull request #1087 done by Mergify.

[mergify]

Cherry-pick of 2e10964 has failed:

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	both modified:   camera_calibration/src/camera_calibration/calibrator.py

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