Remove obsolete TODO in //distro

[thundergolfer]

🧹 🧹 ...

Just removing a TODO we don't need anymore. We not longer use a deps() function to included dependencies and bazelbuild/rules_pkg#72 shows that it's no longer a desired pattern.

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PR Checklist

Please check if your PR fulfills the following requirements:

• Does not include precompiled binaries, eg. .par files. See CONTRIBUTING.md for info
• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature (please, look at the "Scope of the project" section in the README.md file)
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
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• Other... Please describe:

Does this PR introduce a breaking change?

• Yes
• No

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cc @brandjon

[hrfuller]

LGTM