formats: Update to ${concat(…)} to build on current nightly ${concat(…)} replaces the removed concat_idents!() macro, but doesn’t support being used in nested repetitions for now. We can remove the gen_match!() macro once this is supported again.

\.pyc$
\.pyxbldc$
\.c$
\.o$
\.so$
\.pyd$
^build$
^scripts$
^Cargo\.lock$
^target$