Bump pydata-sphinx-theme from 0.16.0 to 0.16.1 in /docs #1961

Job	Run time
test-on-windows	1m 47s
coverage	2m 12s
check-repo-format	14s
pyright-scan-docs	59s
python-38	1m 26s
smoke-test-pydantic-v2	1m 30s
test-against-pre-releases-of-dependencies	1m 25s
test-minimum-dependencies	1m 30s
tests (3.9)	1m 22s
test-third-party	2m 15s
tests (3.10)	1m 28s
tests (3.11)	1m 14s
run-mypy	19s
tests (3.12)	1m 32s
run-pyright	33s
test-docs-builds	36s
	20m 22s

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