Bump golang from fd78f2f to 51a7800 in /build (#4984)

Bumps golang from `fd78f2f` to `51a7800`.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
...

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

build/Dockerfile

@@ -354,7 +354,7 @@ LABEL org.nginx.kic.image.build.nginx.version="${NGINX_PLUS_VERSION}${NGINX_VERS
 
 
 ############################################# Build nginx-ingress in golang container #############################################
-FROM golang:1.21-alpine@sha256:fd78f2fb1e49bcf343079bbbb851c936a18fc694df993cbddaa24ace0cc724c5 AS builder
+FROM golang:1.21-alpine@sha256:51a7800206bc7b276a9d62a7229cdede7b1e0f45ec28259ed44c1603c6cda1e7 AS builder
 ARG IC_VERSION
 ARG TARGETARCH