Update lgpio chip selection to work with more than 1 digit - #1120
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Pull request overview
Updates the generic Linux lgpio backend to correctly select GPIO chips whose sysfs name includes multi-digit indices (e.g., gpiochip11), addressing Raspberry Pi 5 / newer kernel device naming and fixing #1119.
Changes:
- Parse the full numeric suffix of
gpiochip*sysfs entries instead of only the last character. - Open the corresponding lgpio chip using the parsed chip ID.
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Fixes #1119.