Graphviz install with apt-get

.gitlab-ci.yml

@@ -80,7 +80,7 @@ pages:
   stage: deploy
   script:
   - apt update
-  - apt-get -y install graphviz=2.50.0
+  - apt-get -y install graphviz#=2.50.0
   - pip install -U sphinx m2r2 furo pyUML pydot==2.0.0 gprof2dot
   #- pip install graphviz==2.50.0
   - pip install -e .