fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN11-GLIBC-1296898
- https://snyk.io/vuln/SNYK-DEBIAN11-PYTHON39-1290158
- https://snyk.io/vuln/SNYK-DEBIAN11-PYTHON39-1290158
- https://snyk.io/vuln/SNYK-DEBIAN11-PYTHON39-1290158
- https://snyk.io/vuln/SNYK-DEBIAN11-PYTHON39-1290158

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.16.7
+FROM golang:1.16
 
 # Install pact ruby standalone binaries
 RUN curl -LO https://github.com/pact-foundation/pact-ruby-standalone/releases/download/v1.37.0/pact-1.37.0-linux-x86_64.tar.gz; \