fix: build/Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN10-NGHTTP2-5953390
- https://snyk.io/vuln/SNYK-DEBIAN10-SYSTEMD-3339153
- https://snyk.io/vuln/SNYK-DEBIAN10-SYSTEMD-3339153
- https://snyk.io/vuln/SNYK-DEBIAN10-CURL-3065760
- https://snyk.io/vuln/SNYK-DEBIAN10-GIT-3232718

build/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.14.2
+FROM golang:latest
 
 LABEL maintainer="LitmusChaos"