build(deps): bump trame from 3.7.0 to 3.7.6 in /requirements (#535)

Bumps [trame](https://github.com/Kitware/trame) from 3.7.0 to 3.7.6.
- [Release notes](https://github.com/Kitware/trame/releases)
- [Changelog](https://github.com/Kitware/trame/blob/master/CHANGELOG.md)
- [Commits](Kitware/trame@v3.7.0...v3.7.6)

---
updated-dependencies:
- dependency-name: trame
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/requirements_doc.txt

@@ -8,5 +8,5 @@ pyvista==0.43.9
 sphinx-copybutton==0.5.2
 sphinx-gallery==0.18.0
 sphinx-notfound-page==1.0.4
-trame==3.7.0
+trame==3.7.6
 vtk==9.4.1