H2O: Fix a build failure (#10076)

frameworks/C/h2o/h2o.dockerfile

@@ -78,7 +78,8 @@ RUN apt-get -yqq update && \
     apt-get -yqq install \
       libnuma1 \
       libpq5 \
-      libyajl2
+      libyajl2 && \
+    apt-get -yqq upgrade
 ARG H2O_APP_PREFIX
 COPY --from=compile "${H2O_APP_PREFIX}" "${H2O_APP_PREFIX}/"
 COPY --from=compile /usr/local/lib/libmustache_c.so "${H2O_APP_PREFIX}/lib/"

frameworks/Ruby/h2o_mruby/h2o_mruby.dockerfile

@@ -44,6 +44,8 @@ RUN apt-get -yqq update && \
 
 FROM "ubuntu:${UBUNTU_VERSION}"
 
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get -yqq update && apt-get -yqq upgrade
 ARG H2O_PREFIX
 COPY --from=compile "${H2O_PREFIX}/bin/h2o" "${H2O_PREFIX}/bin/"
 COPY --from=compile "${H2O_PREFIX}/share" "${H2O_PREFIX}/share/"