build(deps): bump dtschema from 2024.5 to 2024.9

Bumps [dtschema](https://github.com/devicetree-org/dt-schema) from 2024.5 to 2024.9.
- [Release notes](https://github.com/devicetree-org/dt-schema/releases)
- [Commits](devicetree-org/dt-schema@v2024.05...v2024.09)

---
updated-dependencies:
- dependency-name: dtschema
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -15,5 +15,5 @@ PyYAML == 6.0.2        # for parsing/writing YAML
 oras == 0.1.30         # for OCI stuff in mapper-oci-update
 Jinja2 == 3.1.4        # for templating
 rich == 13.8.1         # for rich text formatting
-dtschema == 2024.5     # for checking dts files and dt bindings
+dtschema == 2024.9     # for checking dts files and dt bindings
 yamllint == 1.35.1     # for checking dts files and dt bindings