build(deps): bump pytest-homeassistant-custom-component

Bumps [pytest-homeassistant-custom-component](https://github.com/MatthewFlamm/pytest-homeassistant-custom-component) from 0.12.8 to 0.12.15.
- [Release notes](https://github.com/MatthewFlamm/pytest-homeassistant-custom-component/releases)
- [Changelog](https://github.com/MatthewFlamm/pytest-homeassistant-custom-component/blob/master/CHANGELOG.md)
- [Commits](MatthewFlamm/pytest-homeassistant-custom-component@0.12.8...0.12.15)

---
updated-dependencies:
- dependency-name: pytest-homeassistant-custom-component
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements_test.txt

@@ -1,5 +1,5 @@
 -r requirements_dev.txt
-pytest-homeassistant-custom-component==0.12.8
+pytest-homeassistant-custom-component==0.12.15
 ocpp==0.15.0
 websockets==10.3
 pytest-cov