ci: backport: Update backport action to v1.1.1-3
ci: backport: Update backport action to v1.1.1-3

This commit updates the backport workflow to use the backport action
v1.1.1-3, which introduces the following enhancements:

1. Cherry-pick backport commits with the `-x` option to improve
   traceability.

2. Disable incorrect warning when "rebase merge" method is enabled.

Signed-off-by: Stephanos Ioannidis <dc76e9f0c0006e8f919e0c515c66dbba3982f785@stephanos.io>

galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr