add ci job to test wheels against oldest dependencies #34

Job	Run time
Build Docker image	1m 9s
Run unit tests in Docker container (only for the Python version used in the Dockerfile command)	1m 13s
Build wheels for cp39-manylinux_x86_64	2m 16s
Build wheels for cp310-manylinux_x86_64	1m 52s
Build wheels for cp311-manylinux_x86_64	1m 54s
Build wheels for cp312-manylinux_x86_64	1m 58s
Build wheels for cp313-manylinux_x86_64	1m 57s
Test wheels against oldest supported versions of dependencies (ubuntu-latest, python:3.9, numpy==...	16s
Test wheels against oldest supported versions of dependencies (ubuntu-latest, python:3.9, numpy==...	28s
Push Docker image to DockerHub	0s
	13m 3s

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