Update dash requirement from ~=3.4.0 to ~=4.0.0

Updates the requirements on [dash](https://github.com/plotly/dash) to permit the latest version.
- [Release notes](https://github.com/plotly/dash/releases)
- [Changelog](https://github.com/plotly/dash/blob/dev/CHANGELOG.md)
- [Commits](plotly/dash@v3.4.0...v4.0.0)

---
updated-dependencies:
- dependency-name: dash
  dependency-version: 4.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@
 # Version is hardcoded to ensure uniformity no matter the platform.
 plotly~=6.5.2
 polars~=1.38.1
-dash~=3.4.0
+dash~=4.0.0
 pytest~=9.0.2
 pylint~=4.0.5
 black~=26.1.0