Sentry release version read relative to the process CWD

[abkfenris]

with Path("pyproject.toml").open("rb") as f:

Resolves against the working directory, so release tagging breaks whenever Django starts from anywhere but /app. importlib.metadata.version("buoy-barn") reads it from installed metadata with no file I/O and no tomllib import; BASE_DIR / "pyproject.toml" is the minimal alternative (note BASE_DIR is currently defined after this block, at :103).

Site: settings.py:86

(from #1781)