Remove the sha256_hash() utility function

netbox/utilities/files.py

@@ -1,13 +0,0 @@
-import hashlib
-
-__all__ = (
-    'sha256_hash',
-)
-
-
-def sha256_hash(filepath):
-    """
-    Return the SHA256 hash of the file at the specified path.
-    """
-    with open(filepath, 'rb') as f:
-        return hashlib.sha256(f.read())