Bump openrefine.version from 3.9.0 to 3.9.3

Bumps `openrefine.version` from 3.9.0 to 3.9.3.

Updates `org.openrefine:main` from 3.9.0 to 3.9.3
- [Release notes](https://github.com/OpenRefine/OpenRefine/releases)
- [Commits](OpenRefine/OpenRefine@3.9.0...3.9.3)

Updates `org.openrefine:core` from 3.9.0 to 3.9.3

---
updated-dependencies:
- dependency-name: org.openrefine:main
  dependency-version: 3.9.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.openrefine:core
  dependency-version: 3.9.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
 
   <properties>
-    <openrefine.version>3.9.0</openrefine.version>
+    <openrefine.version>3.9.3</openrefine.version>
     <!-- Change the values below, as well as the groupId & url, to reflect your extension -->
     <extension.id>openrefine-files-extension</extension.id>
     <extension.name>OpenRefine Files Extension</extension.name>