Bump frolvlad/alpine-glibc in /build/onos-kpimon

Bumps frolvlad/alpine-glibc from alpine-3.12 to alpine-3.20.

---
updated-dependencies:
- dependency-name: frolvlad/alpine-glibc
  dependency-type: direct:production
...

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

build/onos-kpimon/Dockerfile

@@ -18,7 +18,7 @@ COPY build/ /go/src/github.com/onosproject/onos-kpimon/build/
 
 RUN cd /go/src/github.com/onosproject/onos-kpimon && GOFLAGS=-mod=vendor make ${ONOS_MAKE_TARGET}
 
-FROM frolvlad/alpine-glibc:alpine-3.12
+FROM frolvlad/alpine-glibc:alpine-3.20
 
 USER nobody