fix: add trailing newline to init-options.json output

`save_init_options()` omitted a final newline, causing
`end-of-file-fixer` from .pre-commit-config.yaml (#3430) to flag
a diff on every `specify integration upgrade` run.

Append `\n` to the `json.dumps()` output to match POSIX
expectations and align with `integration_state.py` which already
includes the trailing newline.

Ref: #3430

Author: vincentclee

src/specify_cli/_init_options.py

@@ -14,7 +14,7 @@ def save_init_options(project_path: Path, options: dict[str, Any]) -> None:
     dest = project_path / INIT_OPTIONS_FILE
     dest.parent.mkdir(parents=True, exist_ok=True)
     dest.write_text(
-        json.dumps(options, indent=2, sort_keys=True, ensure_ascii=False),
+        json.dumps(options, indent=2, sort_keys=True, ensure_ascii=False) + "\n",
         encoding="utf-8",
     )