scipp/plopp: v23.02.0

What's Changed Update reference API and fix links in docs by @nvaytet in https://github.com/scipp/plopp/pull/138 Make VBar and HBar indexable by @nvaytet in https://github.com/scipp/plopp/pull/139 Update copyright year to 2023 by @nvaytet in https://github.com/scipp/plopp/pull/141 Save 3d figs to html by @nvaytet in https://github.com/scipp/plopp/pull/140 Add rectangle selection example to gallery by @nvaytet in https://github.com/scipp/plopp/pull/142 Use pre-commit in ci by @jl-wynen in https://github.com/scipp/plopp/pull/143 Bump scipp from 22.11.0 to 23.1.1 in /requirements by @dependabot in https://github.com/scipp/plopp/pull/148 Update isort, avoiding broken pre-commit by @SimonHeybrock in https://github.com/scipp/plopp/pull/149 Fix making plot with bin-edge datetime coord and errorbars by @nvaytet in https://github.com/scipp/plopp/pull/151 Allow scalars in scatter3d by @nvaytet in https://github.com/scipp/plopp/pull/126 Scatter3d plots improvements by @nvaytet in https://github.com/scipp/plopp/pull/154 Improve api docs by @nvaytet in https://github.com/scipp/plopp/pull/156 Add gallery example for creating 3-D scatter plot with threshold by @SimonHeybrock in https://github.com/scipp/plopp/pull/155 Cancel running workflows if new push to PR by @nvaytet in https://github.com/scipp/plopp/pull/157 Full Changelog: https://github.com/scipp/plopp/compare/23.01.0...23.02.