Bump MU_BASECORE from 1650bc6 to 88b6c1e (#1357)

Bumps [MU_BASECORE](https://github.com/microsoft/mu_basecore) from `1650bc6` to `88b6c1e`.
- [Release notes](https://github.com/microsoft/mu_basecore/releases)
- [Commits](microsoft/mu_basecore@1650bc6...88b6c1e)

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

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