update recommended libraries

[mbostock]

library	old version	new version	release notes
@observablehq/inputs	0.9.5	0.9.7	https://github.com/observablehq/inputs/releases
@observablehq/plot	0.2.2	0.2.4	https://github.com/observablehq/plot/releases
arquero	4.8.4	4.8.7	https://github.com/uwdata/arquero/releases
d3	7.0.3	7.0.4	https://github.com/d3/d3/releases
htl	0.3.0	0.3.1	https://github.com/observablehq/htl/releases
vega	5.20.2	5.21.0	https://github.com/vega/vega/releases