CI: run sanity tests on ansible-core 2.15 to 2.22 and devel - #95

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744, actions/setup-python@3542bca2639a428e1796aaa6a2ffef0c0f575566, codecov/codecov-action@ab904c41d6ece82784817410c45d8b8c02684457. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/