Bump src/github.com/cloudfoundry/mapfs-release (#522)

Bumps [src/github.com/cloudfoundry/mapfs-release](https://github.com/cloudfoundry/mapfs-release) from `528021d` to `15eadbb`.
- [Release notes](https://github.com/cloudfoundry/mapfs-release/releases)
- [Commits](cloudfoundry/mapfs-release@528021d...15eadbb)

---
updated-dependencies:
- dependency-name: src/github.com/cloudfoundry/mapfs-release
  dependency-type: direct:production
...

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