Updates dependencies

Bumps @aws-sdk/client-s3, nodemailer, sinon, and wait-on to their latest compatible versions.

Release 1.6.20

Release: v1.6.20

Updated libraries.

Merge branch 'release/draft-1.6-1772403074' into 1.6

Updated alpine base image. Re-releasing 1.6.13

Release 1.6.12

Release 1.6.11

Release 1.6.10

Release 1.6.9

Release 1.6.8