Update gosu package as its having vulnerabilities (#97)

* Update gosu package as its having vulnerabilities

* Update Dockerfile

Change version from 1.17 to 1.16 as tests are failing.

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Co-authored-by: Makakmayum Sidik <makakmayum.sidik@globallogic.com>

Dockerfile

@@ -4,7 +4,7 @@ LABEL maintainer="Rodolphe CHAIGNEAU <rodolphe.chaigneau@gmail.com>"
 
 ARG WIREMOCK_VERSION=3.3.1
 ENV WIREMOCK_VERSION $WIREMOCK_VERSION
-ENV GOSU_VERSION 1.14
+ENV GOSU_VERSION 1.16
 
 WORKDIR /home/wiremock