Bump MU_BASECORE from 3fe04e6 to be996c0 (#1396)

Bumps [MU_BASECORE](https://github.com/microsoft/mu_basecore) from `3fe04e6` to `be996c0`.
- [Release notes](https://github.com/microsoft/mu_basecore/releases)
- [Commits](microsoft/mu_basecore@3fe04e6...be996c0)

---
updated-dependencies:
- dependency-name: MU_BASECORE
  dependency-type: direct:production
...

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