deps(deps-dev): update homeassistant requirement

Updates the requirements on [homeassistant](https://github.com/home-assistant/core) to permit the latest version.
- [Release notes](https://github.com/home-assistant/core/releases)
- [Commits](home-assistant/core@2023.9.0...2026.4.4)

---
updated-dependencies:
- dependency-name: homeassistant
  dependency-version: 2026.4.4
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -12,4 +12,4 @@ pytest-asyncio==1.3.0
 pytest-homeassistant-custom-component==0.13.317
 
 # Home Assistant core (for development/testing)
-homeassistant>=2023.9.0
+homeassistant>=2026.4.4