chore(deps): bump redhat/ubi9-minimal in /build

Bumps redhat/ubi9-minimal from `daa61d6` to `b870979`.

---
updated-dependencies:
- dependency-name: redhat/ubi9-minimal
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build/Dockerfile

@@ -16,7 +16,7 @@ FROM ghcr.io/nginxinc/dependencies/nginx-ot:nginx-1.27.3-alpine@sha256:339c91471
 FROM ghcr.io/nginxinc/dependencies/nginx-ubi-ppc64le:nginx-1.27.3@sha256:4cda07664f09f16d780d1e803b9748c31489ea21c463bbcca50d9dcf26081a6f AS ubi-ppc64le
 FROM ghcr.io/nginxinc/alpine-fips:0.2.3-alpine3.17@sha256:67b69b49aff96e185be841e2b2ff2d8236551ea5c18002bffa4344798d803fd8 AS alpine-fips-3.17
 FROM ghcr.io/nginxinc/alpine-fips:0.2.3-alpine3.20@sha256:4c29e5c50b122354d9d4ba6b97cdf64647468e788b965fc0240ead541653454a AS alpine-fips-3.20
-FROM redhat/ubi9-minimal:9.5@sha256:daa61d6103e98bccf40d7a69a0d4f8786ec390e2204fd94f7cc49053e9949360 AS ubi-minimal
+FROM redhat/ubi9-minimal:9.5@sha256:b87097994ed62fbf1de70bc75debe8dacf3ea6e00dd577d74503ef66452c59d6 AS ubi-minimal
 FROM golang:1.23-alpine@sha256:13aaa4b92fd4dc81683816b4b62041442e9f685deeb848897ce78c5e2fb03af7 AS golang-builder