Bump Features/DFCI from 755cc7b to b4efb72 (#1552)

Bumps [Features/DFCI](https://github.com/microsoft/mu_feature_dfci) from `755cc7b` to `b4efb72`.
- [Release notes](https://github.com/microsoft/mu_feature_dfci/releases)
- [Commits](microsoft/mu_feature_dfci@755cc7b...b4efb72)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>