Bump `base` version to 4.9.0.0
Trac metadata
| Trac field | Value |
|---|---|
| Version | |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | highest |
| Resolution | Unresolved |
| Component | libraries/base |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |