[FLINK-11836] Sort concatenated NOTICE files for NOTICE-binary

This will make for less changes in the future because the order in the
NOTICE-binary file is deterministic.

tools/releasing/collect_license_files.sh

@@ -48,7 +48,7 @@ done
 
 NOTICE="${DST}/NOTICE"
 [ -f "${NOTICE}" ] && rm "${NOTICE}"
-find "${TMP}" -name "NOTICE" | xargs cat >> "${NOTICE}"
+find "${TMP}" -name "NOTICE" | sort | xargs cat >> "${NOTICE}"
 
 LICENSES="${DST}/licenses"
 [ -f "${LICENSES}" ] && rm -r ""