Bump Features/DFCI from 981a67c to de8bb4d (#355)

Bumps [Features/DFCI](https://github.com/microsoft/mu_feature_dfci) from `981a67c` to `de8bb4d`.
- [Release notes](https://github.com/microsoft/mu_feature_dfci/releases)
- [Commits](microsoft/mu_feature_dfci@981a67c...de8bb4d)

---
updated-dependencies:
- dependency-name: Features/DFCI
  dependency-type: direct:production
...

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