minor #14440 [Workflow] Update dumping-workflows.rst (ahmed-bhs)

This PR was submitted for the 5.x branch but it was merged into the 4.4 branch instead.

Discussion
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[Workflow] Update dumping-workflows.rst

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Commits
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f1443d4 Update dumping-workflows.rst

Author: javiereguiluz

workflow/dumping-workflows.rst

@@ -309,6 +309,6 @@ The PlantUML image will look like this:
 
 .. image:: /_images/components/workflow/pull_request_puml_styled.png
 
-.. _`Graphviz`: http://www.graphviz.org
+.. _`Graphviz`: https://www.graphviz.org
 .. _`PlantUML`: https://plantuml.com/
 .. _`PlantUML's color list`: https://plantuml.com/color