It seems to be failing because the placeholder is missing:
```
File "/home/docs/checkouts/readthedocs.org/user_builds/heritrix/envs/latest/lib/python3.12/site-packages/sphinx/ext/extlinks.py", line 103, in role
title = caption % part
~~~~~~~~^~~~~~
TypeError: not all arguments converted during string formatting
```
Large portions of the docs were first published much earlier in other
places and some have been updated since then. Rather than trying to
keep a date range up to date let's just remove the date. We don't use
dates in the source code boilerplate and my understanding is copyright
notices are not mandatory in almost all countries due to the Berne
Convention anyway so it's really just informational.
Alex Osborne