maint: Update copyright notices in code generating programs.
* lib/gen-uni-tables.c (output_predicate_test, output_predicate,
output_category, output_combclass, output_bidi_category,
output_decimal_digit_test, output_decimal_digit, output_digit_test,
output_digit, output_numeric_test, output_numeric, output_mirror,
output_joining_type_test, output_joining_type,
output_joining_group_test, output_joining_group, output_scripts,
output_scripts_byname, output_blocks, output_ident_category,
output_nonspacing_property, output_lbrk_tables,
output_lbrk_rules_as_tables, output_wbrk_tables, output_gbp_test,
output_gbp_table, output_decomposition_tables,
output_composition_tables, output_simple_mapping_test,
output_simple_mapping, output_casing_rules): Extend copyright year of
generated file to 2022.
* lib/uniname/gen-uninames.lisp (main): Likewise. Produce license notice
that is consistent with the gnulib/etc/license-notices/ files.
* All files regenerated.