Azure Firewall ASIM Network Parser ICMP code

[vakohl]

Required items, please complete

Change(s):

• Updating regex for ICMP Code extraction. Making it case-insensitive

Reason for Change(s):

• Github issue reported - https://github.com/Azure/Azure-Sentinel/issues/10532

Version Updated:

• 0.1.3 and 0.1.2

Testing Completed:

• Yes

Checked that the validations are passing and have addressed any issues that are present:

• Yes