cppcms: use brewed python

[alebcay]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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Part of #93940. Unlike described in that issue, there's actually a runtime dependency on Python (albeit a small one). There's a Python script installed in bin, cppcms_tmpl_cc.

For now, I'm doing this is as CI-no-bottles. There is indeed a difference in the Python script that is shipped, but it's not exactly a main part of the package. Moreover, the script should continue working on existing installations (where Python 2 is present - except for folks upgrading to Monterey 12.3, I suppose). The upside is that we can keep old bottles. This should also work on Linux now. Open to discussion/making this a full revision/rebuild.

[carlocab]

Since this is a runtime dependency we should publish new bottles.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.