Bernhard Voelker db5ec614a7 maint: update copyright year number ranges
Run 'make update-copyright'.

* lib/regexprops.c (copying): Update the year number manually.
The format of the copyright year number range in Texinfo files is
"YEAR1--YEAR2" now, i.e., with 2x '-'.
* tests/sample-test: Adjust to use the single most recent year.
* All other files: Update copyright years via the above make run.
2022-01-02 18:42:35 +01:00
..
2012-06-05 10:00:50 +01:00