BMI270: use Wire instead of the legacy I2C driver (fixes driver_ng CONFLICT abort on Arduino core 3.2+) - #8

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v3.1.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/