remove memoise library

[jborden]

> clinvar_path <- bake("gdc")
Running stage 'biobricks-ai/gdc/dvc.yaml:download_data':
> Rscript R/build.R

Attaching package: ‘arrow’

The following object is masked from ‘package:utils’:

    timestamp

Error in library(memoise) : there is no package called ‘memoise’
Execution halted
ERROR: failed to reproduce 'biobricks-ai/gdc/dvc.yaml:download_data': failed to run: Rscript R/build.R, exited with 1

[jborden]

In addition, use the GDC http api to download files