refactor: use shared SUBPROCESS_TEXT_KWARGS in _shallow_clone

The git clone call in _source.py used bare `text=True` instead of the
shared SUBPROCESS_TEXT_KWARGS constant, missing `encoding="utf-8"` and
`errors="replace"` that protect against non-decodable output. This
aligns it with every other subprocess call in the codebase.

Co-authored-by: Ralphify <noreply@ralphify.co>

Author: 2 people

src/ralphify/_source.py

@@ -15,6 +15,7 @@
 from pathlib import Path
 
 from ralphify._frontmatter import RALPH_MARKER
+from ralphify._output import SUBPROCESS_TEXT_KWARGS
 
 
 @dataclass(frozen=True)
@@ -106,7 +107,7 @@ def _shallow_clone(repo_url: str, dest: Path) -> None:
         subprocess.run(
             ["git", "clone", "--depth", "1", repo_url, str(dest)],
             capture_output=True,
-            text=True,
+            **SUBPROCESS_TEXT_KWARGS,
             check=True,
         )
     except FileNotFoundError: