Bump golang from 1.21.6-alpine to 1.22.0-alpine

Bumps golang from 1.21.6-alpine to 1.22.0-alpine.

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

Signed-off-by: dependabot[bot] <[email protected]>

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.21.6-alpine AS builder
+FROM golang:1.22.0-alpine AS builder
 RUN apk update && apk add --no-cache git
 WORKDIR $GOPATH/src/istio-config-validator/
 COPY . .