Bump library/nginx from 1.21.5-alpine to 1.21.6-alpine in /build (#2387)
Bump library/nginx from 1.21.5-alpine to 1.21.6-alpine in /build (#2387)

Bumps library/nginx from 1.21.5-alpine to 1.21.6-alpine.

---
updated-dependencies:
- dependency-name: library/nginx
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
nginxinc/kubernetes-ingress,nginxinc/kubernetes-ingress,nginxinc/kubernetes-ingress,nginxinc/kubernetes-ingress