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20009: cpu/native: fix bug in periph_timer r=MrKevinWeiss a=maribu ### Contribution description While debugging https://github.com/RIOT-OS/RIOT/pull/18977#issuecomment-1764258356 it became obvious that the `periph_timer` in `native` is broken and issues early IRQs. This replaces the use of `setitimer` that cannot use a monotonic clock source with `timer_settime()`. ### Testing procedure I have some non-publishable code that tests if the time an ISR fires in terms of `timer_read()` is no earlier than the time expected. This occasionally triggered with `master`, but I didn't see any of these issues anymore with this PR. I guess I should revive my PR to spice up the periph timer tests and add a polished version of this and let this run for an hour or two. The tests ins `tests/periph/timer*` should still succeed on `native`. (They do for me in a container running `riot/riotbuild`). ### Issues/PRs references Found while debugging https://github.com/RIOT-OS/RIOT/pull/18977#issuecomment-1764258356 20042: dist/tools/uf2: add target to also copy families.json file r=MrKevinWeiss a=MichelRottleuthner ### Contribution description The updated UF2 pkg (#20035) stores the family ID in an external .json file. I overlooked that and flashing fails if this file is not present. This PR fixes it by also copying the json into the tool folder. ### Testing procedure Check if the `feather-nrf52840-sense` can be flashed when the new UF2 pkg is cloned freshly. ### Issues/PRs references Fixes a regression introduced with #20035 Co-authored-by: Marian Buschsieweke <marian.buschsieweke@posteo.net> Co-authored-by: Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>