rDCS83cc5c5ee390

Bump System.Memory from 4.5.4 to 4.5.5

Bumps [System.Memory](https://github.com/dotnet/corefx) from 4.5.4 to 4.5.5.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

---
updated-dependencies:
- dependency-name: System.Memory
dependency-type: direct:production
update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>