Bump alpine from 3.18 to 3.19 in /build (#1355)

Bumps alpine from 3.18 to 3.19.

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

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

Author: dependabot[bot]

build/Dockerfile

@@ -9,7 +9,7 @@ RUN go mod download
 COPY . /go/src/github.com/nginxinc/nginx-gateway-fabric
 RUN make build
 
-FROM alpine:3.18 as capabilizer
+FROM alpine:3.19 as capabilizer
 RUN apk add --no-cache libcap
 
 FROM capabilizer as local-capabilizer