chore(submodule): bump etc/data/magfield from ba858a8 to 72f3246 (#1427)

Bumps etc/data/magfield from `ba858a8` to `72f3246`.

---
updated-dependencies:
- dependency-name: etc/data/magfield
  dependency-version: 72f32467cb757394c75a1bcffc84af2f37615fd0
  dependency-type: direct:production
...

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