Bump StatsBase version to 0.33

[xinkai-zhou]

Somehow after updating the JuliaDB package, I will get that StatsBase is restricted to 0.24.0-0.32.2.

ERROR: Unsatisfiable requirements detected for package StatsBase [2913bbd2]:
StatsBase [2913bbd2] log:
├─possible versions are: 0.24.0-0.33.10 or uninstalled
├─restricted to versions * by an explicit requirement, leaving only versions 0.24.0-0.33.10
├─restricted by compatibility requirements with WiSER [2ff19380] to versions: 0.33.0-0.33.10
│ └─WiSER [2ff19380] log:
│ ├─possible versions are: 0.1.2 or uninstalled
│ └─restricted to versions * by an explicit requirement, leaving only versions 0.1.2
└─restricted by compatibility requirements with JuliaDB [a93385a2] to versions: 0.24.0-0.32.2 — no versions left
└─JuliaDB [a93385a2] log:
├─possible versions are: 0.9.0-0.13.1 or uninstalled
└─restricted to versions * by an explicit requirement, leaving only versions 0.9.0-0.13.1

[hdavid16]

Please release a version of JuliaDB with the updated compat!