fix(deps): update dependency mermaid to v9 [security]

Author: renovate[bot]

web/package.json

@@ -37,7 +37,7 @@
     "cytoscape-elk": "2.0.2",
     "cytoscape-node-html-label": "1.2.0",
     "html2canvas": "1.0.0-rc.5",
-    "mermaid": "8.5.0",
+    "mermaid": "9.1.2",
     "potrace": "2.1.6",
     "react": "16.13.1",
     "react-dom": "16.13.1",