Fix panics for out-of-range timestamps #901

Job	Run time
build-vegafusion-packages	1m 44s
build-vegafusion-jupyter-packages	12m 37s
build-vegafusion-python-embed-linux-64	11m 14s
build-vegafusion-python-embed-linux-arm64	12m 6s
build-vegafusion-python-embed-osx-64	26m 36s
build-vegafusion-python-embed-osx-arm64	30m 24s
build-vegafusion-python-embed-win-64	23m 16s
build-vegafusion-server-linux-64	9m 19s
build-vegafusion-server-linux-arm64	11m 9s
build-vegafusion-server-osx-64	29m 28s
build-vegafusion-server-osx-arm64	25m 56s
build-vegafusion-server-win-64	23m 33s
build-vegafusion-wasm	7m 29s
check-rust	4m 43s
test-rust (ubuntu-20.04)	24m 38s
test-rust (windows-2022)	52m 9s
test-rust (macos-11)	1h 2m 9s
test-vegafusion-python-linux-64	9m 10s
test-vegafusion-jupyter-linux-64	26m 45s
test-vegafusion-python-win-64	13m 40s
test-vegafusion-python-osx-64	25m 30s
	7h 23m 35s

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