Tests

add NetworkLink support and property-based tests for KML #1631

Job	Run time
Build & inspect our package.	16s
doctest-lxml (3.12)	39s
cpython (3.8)	12s
cpython (3.9)	15s
cpython-lxml (3.8)	3m 10s
cpython (3.10)	11s
pypy (pypy-3.8)	31s
cpython-lxml (3.9)	3m 15s
static-tests (3.12)	31s
cpython (3.11)	12s
pypy (pypy-3.9)	27s
cpython-lxml (3.10)	3m 27s
cpython (3.12)	14s
pypy (pypy-3.10)	33s
cpython-lxml (3.11)	3m 39s
cpython (3.13)	21s
cpython-lxml (3.12)	4m 43s
cpython (3.14-dev)	27s
cpython-lxml (3.13)	4m 59s
Publish to PyPI on push to main	0s
Test install on TestPyPI	0s
	28m 2s

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