support unversioned boards #565

Job	Run time
Build Docs	1m 54s
Test a fork PR (no secrets)	0s
Test Posit Connect	5m 28s
Tests (3.8, ubuntu-latest, --workers 4 --tests-per-worker 1)	2m 9s
Tests (3.9, ubuntu-latest, --workers 4 --tests-per-worker 1)	2m 21s
Tests (3.10, ubuntu-latest, --workers 4 --tests-per-worker 1)	2m 0s
Tests (3.11, ubuntu-latest, --workers 4 --tests-per-worker 1)	4m 43s
Tests (ubuntu-latest, 3.8, requirements/minimum.txt)	6m 38s
Tests (macos-latest, 3.10, --workers 4 --tests-per-worker 1 -k pins/tests)	5m 47s
Tests (windows-latest, 3.10, -k pins/tests)	8m 47s
Preview Docs:	45s
Release to pypi	0s
Publish Docs	0s
	40m 32s

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