Bump golang from 1.18.1 to 1.18.4 (#175)

Bumps golang from 1.18.1 to 1.18.4.

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

Author: ibm-ci-bot

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.18.1 as builder
+FROM golang:1.18.4 as builder
 ARG GOARCH
 
 WORKDIR /workspace