automate rpi-pico serprog builds

./build rpi-pico serprog
build bin/serprog/rpi-pico-serprog.uf2

Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>

script/update/project/repo

@@ -84,6 +84,7 @@ clone_project()
 	[ ! -d "${location}" ] || \
 		rm -Rf "${location}" || \
 		    fail "clone_project: Can't remove directory '${location}'"
+	mkdir -p ${location%/*}
 	mv "${tmp_dir}" "${location}" || \
 	    fail "clone_project: could not copy temp file to destination"
 }