Update pyyaml requirement

Updates the requirements on [pyyaml](https://github.com/yaml/pyyaml) to permit the latest version.

Updates `pyyaml` to 6.0.2
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/main/CHANGES)
- [Commits](yaml/pyyaml@3.01...6.0.2)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

vizro-core/pyproject.toml

@@ -15,7 +15,7 @@ classifiers = [
   "Programming Language :: Python :: 3.12"
 ]
 dependencies = [
-  "pyyaml<5",
+  "pyyaml<7",
   "dash>=2.17.1",  # 2.17.1 needed for no_output fix in clientside_callback
   "dash_bootstrap_components",
   "dash-ag-grid>=31.0.0",