fix typecheck

Change-Id: I0d416d8396fb973e00d9f5d9a09eb39127b42158
Co-developed-by: Cursor <[email protected]>

Author: yyuuttaaoo

util/opentelemetry-util-genai/src/opentelemetry/util/genai/_upload/completion_hook.py

@@ -172,10 +172,9 @@ def _calculate_ref_path(
         if is_system_instructions_hashable(system_instruction):
             # Get a hash of the text.
             system_instruction_hash = hashlib.sha256(
-                "\n".join(
-                    str(x.content)
-                    for x in system_instruction  # pyright: ignore[reportUnknownMemberType, reportAttributeAccessIssue, reportUnknownArgumentType]
-                ).encode("utf-8"),
+                "\n".join(x.content for x in system_instruction).encode(  # pyright: ignore[reportUnknownMemberType, reportAttributeAccessIssue, reportUnknownArgumentType]
+                    "utf-8"
+                ),
                 usedforsecurity=False,
             ).hexdigest()
         uuid_str = str(uuid4())