Upgrade H5Web to v9

Attn @marcus.oscarsson

• Release notes: https://github.com/silx-kit/h5web/releases/tag/v9.0.0
• Main changes relating to Braggy:
  • ✨ Allow zooming on very thin selection boxes
  • 🐛 Fix saving WebGL canvas as image via "save image as"
  • 🐛 Moving one histogram marker now toggles off autoscale only for the corresponding bound (i.e. min or max, not both)
• FYI, the following change does not work when using Braggy in Firefox, because the interaction is bound to the Shift modifier key:
  • Allow cancelling selection-based interactions with right click