Release type: minor

* Add new URL pattern to ``PAGINATION_PATTERNS`` for the last page in the list `(#1401) <https://github.com/getpelican/pelican/issues/1401>`_
* Speed up ``livereload`` Invoke task via caching `(#2847) <https://github.com/getpelican/pelican/pull/2847>`_
* Ignore ``None`` return value from ``get_generators`` signal `(#2850) <https://github.com/getpelican/pelican/pull/2850>`_
* Relax dependency minimum versions and remove upper bounds