build(deps): bump golang from 1.18.3-alpine3.15 to 1.18.4-alpine3.15 (#2592)

Bumps golang from 1.18.3-alpine3.15 to 1.18.4-alpine3.15.

---
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

@@ -1,6 +1,6 @@
 ARG BASE_IMAGE=alpine
 
-FROM golang:1.18.3-alpine3.15 AS builder
+FROM golang:1.18.4-alpine3.15 AS builder
 
 WORKDIR /usr/local/src/dex