modbus: serial: use `gpio_dt_spec` pointer-based API#97008

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ndrs-pst wants to merge 2 commits intozephyrproject-rtos:mainfrom

DDC-NDRS:pr_modbus_serial_2025-10-04

Commits on Oct 4, 2025

modbus: serial: use `gpio_pin_set_dt()` for de/re pin control
ndrs-pst
committed

Commits on Oct 6, 2025

modbus: serial: use `gpio_is_ready_dt()` for GPIO readiness check
ndrs-pst
committed