[REF] odoo-shippable: py3.7 stuffs
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[REF] odoo-shippable: Add link symbolic python3.7-dev virtual environment for compatibility with travis.yml
https://docs.travis-ci.com/user/languages/python/#Specifying-Python-versions
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[REF] odoo-shippable: Remove custom version for 3.7
Fixed from https://github.com/odoo/odoo/pull/25841