Fix Python CI by using micromamba with OpenSSL 3.5+#148
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The CI was failing because juliacall's OpenSSL_jll version matching (<=python) requires OpenSSL compatible with both Python and Julia. Julia 1.12 requires OpenSSL 3.5+, but uv's python-build-standalone ships OpenSSL 3.0.x, causing version conflicts. Fix by using micromamba to install Python 3.13 with OpenSSL >= 3.5 from conda-forge, which properly supports Julia 1.12. See: JuliaPy/PythonCall.jl#682 https://claude.ai/code/session_01HZPTU4LvfhcJG4WUrEWbYU
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Apparently the Julia shipped by e.g. uv is still compiled using an outdated version of OpenSSL. We need OpenSSL 3.5+, and need to fetch a python version installed with that. For some reason, micromamba delivers that. So now we first install python via micromamba and then give that python executable to our JuliaCall/PythonCall interface to test everything.