Fix doc building via run build_package
#553
Merged
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Current pinnings in the requirements.txt for doc builds could not be satisfied (CuPy 9.3 appears to no longer be available on PyPI).
The key changes to those requirements are:
1.) use newer CuPy
2.) bump numpy to a version supported by CuPy
3.) bump sphinx to 4.5 so it is compatible with recent
jinja2
4.) relax most other pinnings
A separate commit fixes several broken links discovered by the link checker during the doc builds.