Update wiki to 1.39.6

Dockerfile

@@ -1,7 +1,7 @@
 FROM php:7.4-apache
 
 ENV WIKI_VERSION_MAJOR_MINOR=1.39
-ENV WIKI_VERSION_BUGFIX=5
+ENV WIKI_VERSION_BUGFIX=6
 ENV WIKI_VERSION=$WIKI_VERSION_MAJOR_MINOR.$WIKI_VERSION_BUGFIX
 ENV WIKI_VERSION_STR=1_39
 
@@ -99,12 +99,12 @@ RUN EXTS=`curl https://extdist.wmflabs.org/dist/extensions/ | awk 'BEGIN { FS =
     # WARNING: if updating DynamicPageList3 from 3.5.1, check if fix below is still required \
     && echo "Installing https://github.com/Universal-Omega/DynamicPageList3/archive/refs/tags/3.5.1.tar.gz" \
     && mkdir -p /var/www/html/extensions/DynamicPageList \
-    && curl -Ls https://github.com/Universal-Omega/DynamicPageList3/archive/refs/tags/3.5.1.tar.gz | tar xz --strip=1 -C /var/www/html/extensions/DynamicPageList 
+    && curl -Ls https://github.com/Universal-Omega/DynamicPageList3/archive/refs/tags/3.5.1.tar.gz | tar xz --strip=1 -C /var/www/html/extensions/DynamicPageList
     ##Comment out to use with MW Extension method
     ##&& echo "Installing SmiteSpam https://github.com/wikimedia/mediawiki-extensions-SmiteSpam/archive/REL1_39.zip" \
     ##&& curl -L -o smitespam.zip https://github.com/wikimedia/mediawiki-extensions-SmiteSpam/archive/REL1_39.zip \
     ##&& unzip smitespam.zip -d /var/www/html/extensions/ \
-    ##&& mv /var/www/html/extensions/mediawiki-extensions-SmiteSpam-REL1_39 /var/www/html/extensions/SmiteSpam  
+    ##&& mv /var/www/html/extensions/mediawiki-extensions-SmiteSpam-REL1_39 /var/www/html/extensions/SmiteSpam
     #&& echo "Installing patched Math extension from https://github.com/ubc/mediawiki-extensions-Math/archive/REL1_35.tar.gz" \
     #&& mkdir -p /var/www/html/extensions/Math \
     #&& curl -Ls https://github.com/ubc/mediawiki-extensions-Math/archive/REL1_35.tar.gz | tar xz --strip=1 -C /var/www/html/extensions/Math