upgrade mermaid lib; bump version for release

Author: raghur

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mermaid-filter",
-  "version": "1.4.2",
+  "version": "1.4.3",
   "description": "Pandoc filter for mermaid",
   "main": "index.js",
   "scripts": {
@@ -21,7 +21,7 @@
     "@mermaid-js/mermaid-cli": "^8.4.8",
     "imgur": "^0.3.1",
     "lodash": "^4.17.13",
-    "mermaid": "^7.1.2",
+    "mermaid": "^8.4.8",
     "pandoc-filter": "^0.1.3",
     "sanitize-filename": "1.6.1",
     "tmp": "0.0.28"