SeqInfo constructor breaks on numpy integers in seqlengths

[LTLA]

For example:

import genomicranges
genomicranges.SeqInfo(["A"], seqlengths=[100])
## SeqInfo(number_of_seqnames=1, seqnames=['A'], seqlengths=[100], is_circular=[None], genome=[None])
genomicranges.SeqInfo(["A"], seqlengths=[numpy.uint64(100)])
## Traceback (most recent call last):
##  File "<stdin>", line 1, in <module>
##  File "/Users/luna/Library/Python/3.11/lib/python/site-packages/genomicranges/SeqInfo.py", line 152, in __init__
##     _validate_seqlengths(self._seqlengths, num_seqs)
##  File "/Users/luna/Library/Python/3.11/lib/python/site-packages/genomicranges/SeqInfo.py", line 25, in _validate_seqlengths
##     raise ValueError("'seqlengths' should be a list of integers.")
## ValueError: 'seqlengths' should be a list of integers.

Don't use is_list_of_type() if NumPy types might be present, or cast them to int() beforehand, e.g., by putting them into a IntegerList().

[LTLA]

breaks dolomite-ranges when there are no None values in the seqlengths or is_circular.