Bump golang from 1.18.2 to 1.18.3 (#1199)

Bumps golang from 1.18.2 to 1.18.3.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

-FROM golang:1.18.2 AS build
+FROM golang:1.18.3 AS build
 WORKDIR /go/src/github.com/aquasecurity/kube-bench/
 COPY makefile makefile
 COPY go.mod go.sum ./

Dockerfile.ubi8

-FROM golang:1.18.2 AS build
+FROM golang:1.18.3 AS build
 WORKDIR /go/src/github.com/aquasecurity/kube-bench/
 COPY makefile makefile
 COPY go.mod go.sum ./