Use newer S3 node package to patch security vulnerability with mime < 1.4.1

[emerick]

Fixes #9

I tested by running the following command locally, which uses release-tools to upload the Brave Dark Theme extension to S3:

node bin/updateExtensions.js \
     --chromium=0.0.0.0 \
     --id bfdgpgibhagkpdlnjonhkabjoijopoge \
     --location=../vault-updater/data \
     --path=c:/mongoose/bfdgpgibhagkpdlnjonhkabjoijopoge/extension_1_0_0.crx \
     --version=1.0.0 \
     --v=2

[emerick]

@aekeus / @bsclifton This is to address a security vulnerability in mime 1.4.1, see #9 for additional details. I don't have permission to add a reviewer to this it seems, but was hoping one of you could take a look.

[bsclifton]

LGTM - once merged, we can easily test by doing browser-laptop builds

[emerick]

Thanks @bsclifton!