Update Hugo to version 0.56.3

Dockerfile

@@ -9,9 +9,9 @@
 # to work around segmentation fault issues.
 FROM golang:1.12-alpine
 ARG HUGO=hugo
-ARG HUGO_VERSION=0.56.2
-ARG HUGO_SHA=4b9abd6339ccd5b432c4872be82b9ee9030e1f6242e452e6fe47382808971826
-ARG HUGO_EXTENDED_SHA=853e4a81a97dfb0830e8db8225d19939da9b0c042220c39592cbadc770dda99c
+ARG HUGO_VERSION=0.56.3
+ARG HUGO_SHA=e77aafdb1b9c7442a5c4dd32c03443d8ac578cc838704b975686ec0d87797907
+ARG HUGO_EXTENDED_SHA=4c7d3dd394e0ea34e353418b81ab8123f07006a529b432436c361cb9d04987ed
 RUN set -eux && \
     case ${HUGO} in \
       *_extended) \