Fix copyright header in utils.py to use standard Microsoft format (#65)

* Initial plan

* Fix copyright header in utils.py to use standard Microsoft format

Co-authored-by: nikhilNava <211831449+nikhilNava@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: nikhilNava <211831449+nikhilNava@users.noreply.github.com>

Author: Copilot

libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/utils.py

@@ -1,4 +1,5 @@
-# Copyright (c) Microsoft. All rights reserved.
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
 
 import datetime
 import functools