build(deps-dev): bump ruff from 0.15.9 to 0.15.12 in /hedera

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.15.9 to 0.15.12.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.9...0.15.12)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

hedera/poetry.lock

@@ -17,7 +17,7 @@ hiero-did-sdk-python = "0.1.6"
 aca-py = ["acapy-agent"]
 
 [tool.poetry.group.dev.dependencies]
-ruff = "^0.15.4"
+ruff = "^0.15.12"
 pytest = "^8.3.5"
 pytest-asyncio = "^1.2.0"
 pytest-cov = "^5.0.0"