[ci] Revive script for updating headers.

update_headers.sh

+#!/usr/bin/env bash
+set -xe
+NEW_DATE=$(date "+%Y")
+OLD_DATE=$(date -d '1 year ago' "+%Y")
+find . \( -type d -name .git -prune \) \( -type d -name ._build -prune \) -o -type f -print0 | xargs -0 sed -i 's/(C) '${OLD_DATE}'/(C) '${NEW_DATE}'/g'
\ No newline at end of file