Bump golang from 1.18.2 to 1.18.3 (#88)

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

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.18.2 as builder
+FROM golang:1.18.3 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests