fix ditaa standalone url

Author: jakoch

.github/workflows/build-docs.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Install Ditaa
         run: |
-          wget -q https://github.com/jodaf/ditaa/releases/download/v1.0.0/ditaa-1.0.0-standalone.jar -O /usr/local/bin/ditaa.jar
+          wget -q https://github.com/stathissideris/ditaa/releases/download/v0.11.0/ditaa-0.11.0-standalone.jar -O /usr/local/bin/ditaa.jar
           chmod +x /usr/local/bin/ditaa.jar
           echo "DIAGRAM_DITAA_CLASSPATH=/usr/local/bin/ditaa.jar" >> $GITHUB_ENV