chore(autoware.repos): update TODO comment

[youtalk]

Description

This PR removes the TODO comment written in #5011. There is no longer any dependency on autoware_auto_msgs by tier4/tier4_ad_api_adaptor#124.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

Interface changes

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[xmfcx]

History:

• refactor: move external repositories to src/external autoware_core_universe_prototype#374 (comment)
• refactor: move external repositories to src/external autoware_core_universe_prototype#374 (comment)

@yukkysaito said:

But almost all API in tier4_ad_api_adaptor should be defined Autoware interface by AWF in near future. Then remove tier4_ and move to AWF repository.

(Older PR/issues are in archived https://github.com/autowarefoundation/autoware_core_universe_prototype repository)

[youtalk]

@xmfcx Thank you for the explanation. I've changed the title too.

[xmfcx]

Thanks!