fix dependencies that were breaking the darwin/arm64 build

[williepaul]

The homebrew darwin/arm64 build is broken due to some dependencies.

Steps to reproduce:
Download the build via curl: curl https://codeload.github.com/accurics/terrascan/tar.gz/v1.3.0 > v1.3.0.tar.gz
Extract, then run:
GOOS=darwin GOARCH=arm64 go1.16beta1 build -trimpath -o terrascan ./cmd/terrascan

.../go/pkg/mod/github.com/hashicorp/go-getter@v1.5.1/get_git.go:20:2: missing go.sum entry for module providing package github.com/hashicorp/go-version; try 'go mod tidy' to add it
pkg/cli/run.go:30:2: missing go.sum entry for module providing package github.com/mattn/go-isatty; try 'go mod tidy' to add it
pkg/iac-providers/kustomize/v3/load-dir.go:11:2: missing go.sum entry for module providing package sigs.k8s.io/kustomize/api/filesys; try 'go mod tidy' to add it
pkg/iac-providers/kustomize/v3/load-dir.go:12:2: missing go.sum entry for module providing package sigs.k8s.io/kustomize/api/krusty; try 'go mod tidy' to add it

The updated files are provided via go mod tidy.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
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[codecov]

Codecov Report

Merging #507 (4b7462e) into master (8e3e41b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #507   +/-   ##
=======================================
  Coverage   73.73%   73.73%           
=======================================
  Files          93       93           
  Lines        2151     2151           
=======================================
  Hits         1586     1586           
  Misses        429      429           
  Partials      136      136