Bump frolvlad/alpine-glibc in /build/onos-e2t

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] <[email protected]>

build/onos-e2t/Dockerfile

@@ -20,7 +20,7 @@ WORKDIR /build
 RUN GOFLAGS=-mod=vendor make ${ONOS_MAKE_TARGET}
 
 # So that dynamically linked modules that depend on glibc can be loaded i.e. the service models
-FROM frolvlad/alpine-glibc:alpine-3.12
+FROM frolvlad/alpine-glibc:alpine-3.20
 
 USER nobody