build: Remove deprecated python3 Meson module use
We are using the deprecated python3 module for historical reasons. We used to support both Python 2 and Python 3 in the Autotools build, but since we switched to Meson we *know* we have Python 3 available. This allows us to use a shebang line in the Python scripts we use in the build, instead of invoking them through the Python interpreter in a custom target; Meson knows how to handle shebangs portably as well. This change removes the only deprecation warning coming from Meson when configuring the Pango build.
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