[sonic-platform-daemons] Update submodule (#7251)

src/sonic-platform-daemons 450b7d7...0bd9f69 (2):
- [thermalctld] Fix 'NameError("name 'chassis' is not defined")' error in log (#170)
- [xcvrd] Gracefully handle improper 'specification_compliance' field; also fix other potential bugs (#169)