Use regex to find python path for boost build
Use regex to find python path for boost build

The previous command was only able to match version numbers with a single-digit
subversion, which doesn't work with future versions of Python starting with
3.10. Use 'find' with a more future-proof regex to find the Python executable
instead.

Signed-off-by: Matheus Castanho <531577e2ea6a1eef9cdabce582a2b074021a1180@linux.ibm.com>

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