fix: upgrade com.vladsch.flexmark:flexmark-html2md-converter from 0.64.4 to 0.64.6 (#1331)

Snyk has created this PR to upgrade com.vladsch.flexmark:flexmark-html2md-converter from 0.64.4 to 0.64.6.

See this package in Maven Repository:
https://mvnrepository.com/artifact/com.vladsch.flexmark/flexmark-html2md-converter/

See this project in Snyk:
https://app.snyk.io/org/nosqlbench/project/024e32ec-7f80-485c-b7bf-f69d45f933ce?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

nb-api/pom.xml

@@ -68,7 +68,7 @@
         <dependency>
             <groupId>com.vladsch.flexmark</groupId>
             <artifactId>flexmark-html2md-converter</artifactId>
-            <version>0.64.4</version>
+            <version>0.64.6</version>
         </dependency>
 
         <dependency>