[ECS] [request]: Increase ENI trunking limits for m6i instances

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**Tell us about your request**
m6i ENI Trunking limits are much lower than m5 instances. Please consider increasing the Trunking limits for the new instances family.

**Which service(s) is this request for?**
ECS

The issue names no repository files, tests, or entry points; start by reviewing the ECS request and comparing the stated ENI trunking limits for m6i and m5 instances. Done would require the requested increase to be addressed for the m6i instance family, but the issue does not define an implementation path or repository-level acceptance test.

Written by the indexing model from the issue text.