Update Ubuntu images to 19.10

ci/docker/s390x-unknown-linux-gnu/Dockerfile

-FROM ubuntu:19.04
+FROM ubuntu:19.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         curl ca-certificates \

ci/docker/sparc64-unknown-linux-gnu/Dockerfile

-FROM ubuntu:19.04
+FROM ubuntu:19.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         curl ca-certificates \

ci/docker/wasm32-unknown-emscripten/Dockerfile

-FROM ubuntu:19.04
+FROM ubuntu:19.10
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/x86_64-linux-android/Dockerfile

-FROM ubuntu:19.04
+FROM ubuntu:19.10
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

ci/docker/x86_64-unknown-linux-gnu/Dockerfile

-FROM ubuntu:19.04
+FROM ubuntu:19.10
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc libc6-dev ca-certificates linux-headers-generic

ci/docker/x86_64-unknown-linux-gnux32/Dockerfile

-FROM ubuntu:19.04
+FROM ubuntu:19.10
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc-multilib libc6-dev ca-certificates

ci/docker/x86_64-unknown-linux-musl/Dockerfile

-FROM ubuntu:19.04
+FROM ubuntu:19.10
 
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \