Merge pull request #2548 from dexidp/dependabot/docker/golang-1.18.3-alpine3.15

build(deps): bump golang from 1.18.2-alpine3.15 to 1.18.3-alpine3.15

Dockerfile

 ARG BASE_IMAGE=alpine
 
-FROM golang:1.18.2-alpine3.15 AS builder
+FROM golang:1.18.3-alpine3.15 AS builder
 
 WORKDIR /usr/local/src/dex