fix: use incremental hashing in CatalogDescriptor.get_hash() to avoid loading entire file into memory

CatalogDescriptor.get_hash() called fh.read() which loads the entire
file into memory before hashing. Use incremental hashlib.sha256().update()
with 64 KiB chunks to prevent unbounded memory allocation on large
catalog descriptor files.

Author: Quratulain-bilal

src/specify_cli/integrations/catalog.py

@@ -841,5 +841,8 @@ def tools(self) -> List[Dict[str, Any]]:
 
     def get_hash(self) -> str:
         """SHA-256 hash of the descriptor file."""
+        h = hashlib.sha256()
         with open(self.path, "rb") as fh:
-            return f"sha256:{hashlib.sha256(fh.read()).hexdigest()}"
+            for chunk in iter(lambda: fh.read(65536), b""):
+                h.update(chunk)
+        return f"sha256:{h.hexdigest()}"