python: add 3.10 - 3.15 to the version search list Fixes automake bug https://bugs.gnu.org/53530. Based on the cadence of Automake releases, add the current Python release (3.10), the current Python development (3.11), and then 4 more versions on top of that. It doesn't hurt to check for a few extra versions here since this is the fallback logic when the main `python` and `python3` programs aren't found. * m4/python.m4: Add python3.10 - python3.15. * NEWS: Mention new Python versions.