Update pyvista[all,trame] requirement from <=0.43 to <=0.43.8

Updates the requirements on [pyvista[all,trame]](https://github.com/pyvista/pyvista) to permit the latest version.
- [Release notes](https://github.com/pyvista/pyvista/releases)
- [Commits](pyvista/pyvista@0.3.2...v0.43.8)

---
updated-dependencies:
- dependency-name: pyvista[all,trame]
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -59,7 +59,7 @@ docs = [
   "jupytext",
   "matplotlib",
   "jupyter-book==1.0.0",
-  "pyvista[all,trame]<=0.43"
+  "pyvista[all,trame]<=0.43.8"
 ]
 femwell = [
   "femwell>=0.1.6,<0.2",