Update Hugo to version 0.78.2

Dockerfile

@@ -9,9 +9,9 @@
 # to work around segmentation fault issues.
 FROM golang:1.13-alpine
 ARG HUGO=hugo
-ARG HUGO_VERSION=0.78.1
-ARG HUGO_SHA=e0d1b3ca30426931084dd6a0abb451be28f6a3dd23d85d87d272a1f95782912d
-ARG HUGO_EXTENDED_SHA=145a4c14003c841ec5c194b361e4a16b463514df1348c1b11a9af76fd727f338
+ARG HUGO_VERSION=0.78.2
+ARG HUGO_SHA=6c139580bf42dd66615f61cb33d62fc47cb855790d744050d78924bf1f48df0d
+ARG HUGO_EXTENDED_SHA=26410c5ddf2124d6d99b3d0ee00dcae1e16c1a3ccb9feae025d76c0f3c04745e
 RUN set -eux && \
     case ${HUGO} in \
       *_extended) \