Update OCCT and pythonocc to 7.6.2

[joergbrech]

Closes #31

[AntonReiswich]

The last action required here is the conflict. I assume in both conflicts the number 0 is to keep.

[joergbrech]

Please merge this after #35

[joergbrech]

@AntonReiswich This is ready for review again. Note that I had an issue after the merge of #35:

• The github runner image ubuntu-20.04 comes with swig 4.0.1 pre-installed, while ubunut-22.04 has swig 4.0.2 pre-installed, see the readmes here.
• building pythonocc now requires swig>=4.0.2. This requirement is added to the meta.yml file and conda-build installs the correct swig version into a dedicated build environment.
• For some reason, the system-wide installation /usr/bin/swig4.0 gets picked up by cmake during the conda-build command instead of the one from the decicated build environment. This wasn't an issue on ubuntu-22.04, where the correct version was installed, but it is on ubuntu-20.04: Cmake complains that it finds an unsuitable swig version, ignoring the one from the conda-build build environment.
• As a workaround I just sudo rm /usr/bin/swig4.0 on ubuntu-20.04 as part of the CI.

PS: Sorry for force-pushing, but I needed to have both opencascade and pythonocc altered as part of the last commit so that the python script builds both packages in CI

[AntonReiswich]

Hm, I don't understand what this conditional and this line is for??

[joergbrech]

I didn't write this patch manually, but created it using git diff. The patch file contains the lines preceeding the actually modified lines, which are given in line 9 and 10 below. The patch makes sure that transient dependencies are linked privately.

So this conditional wasn't written by me, but is part of opencascade.

[AntonReiswich]

I see, thank you!