Update Hugo to version 0.75.0

Dockerfile

@@ -9,9 +9,9 @@
 # to work around segmentation fault issues.
 FROM golang:1.13-alpine
 ARG HUGO=hugo
-ARG HUGO_VERSION=0.74.3
-ARG HUGO_SHA=269482fff497051a7919da213efa29c7f59c000e51cf14c1d207ecf98d87bf33
-ARG HUGO_EXTENDED_SHA=f9aadb70d1edb2a82cefb866acb717ebaa12f3a7f008e589495a142567669b57
+ARG HUGO_VERSION=0.75.0
+ARG HUGO_SHA=3628614c0cdeefa4eb2530cd653c2d6084b5c68aaa65138790d680a40898b8c2
+ARG HUGO_EXTENDED_SHA=f2cd128b877b15f695fbd64167cf1b414849886113845228a8247ca54a6acf13
 RUN set -eux && \
     case ${HUGO} in \
       *_extended) \