Bump alpine from 3.12 to 3.19 in /build/plugins

Bumps alpine from 3.12 to 3.19.

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

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

Author: dependabot[bot]

build/plugins/Dockerfile

@@ -15,7 +15,7 @@ WORKDIR /build
 RUN GOFLAGS=-mod=vendor CGO_ENABLED=1 go build -o ${PLUGIN_MAKE_TARGET}.so.${PLUGIN_MAKE_VERSION} \
     -buildmode=plugin github.com/onosproject/onos-e2-sm/servicemodels/${PLUGIN_MAKE_TARGET}
 
-FROM alpine:3.12
+FROM alpine:3.19
 ARG PLUGIN_MAKE_TARGET
 ARG PLUGIN_MAKE_VERSION
 COPY --from=pluginbuild /build/${PLUGIN_MAKE_TARGET}.so.${PLUGIN_MAKE_VERSION} /

build/plugins/ransim.Dockerfile

@@ -20,7 +20,7 @@ RUN cd /go/src/github.com/onosproject/ran-simulator && \
 CGO_ENABLED=1 go build -o build/_output/${PLUGIN_MAKE_TARGET}.so.${PLUGIN_MAKE_VERSION} \
 -buildmode=plugin github.com/onosproject/onos-e2-sm/servicemodels/${PLUGIN_MAKE_TARGET}
 
-FROM alpine:3.12
+FROM alpine:3.19
 ARG PLUGIN_MAKE_TARGET
 ARG PLUGIN_MAKE_VERSION
 COPY --from=pluginbuild /go/src/github.com/onosproject/ran-simulator/build/_output/${PLUGIN_MAKE_TARGET}.so.${PLUGIN_MAKE_VERSION} /