SHP Exporter could not resolve org.geotools:gt-api dependency

This [SHP Exporter](https://gephi.org/plugins/#/plugin/shpexporter) plugin could not be migrated automatically to the 0.9.3 version of Gephi.

The error has to do with some external dependency named `org.geotools:gt-api`. Maybe something has changed since the plugin was created.
```
[ERROR] Failed to execute goal on project shpexporter: Could not resolve dependencies for project at.granul.gephi:shpexporter:nbm:1.1.0:
Failed to collect dependencies at org.geotools:gt-api:jar:17.2:
Failed to read artifact descriptor for org.geotools:gt-api:jar:17.2:
Could not transfer artifact org.geotools:gt-api:pom:17.2 from/to maven-default-http-blocker (http://0.0.0.0/): Blocked mirror for repositories: [osgeo (http://download.osgeo.org/webdav/geotools/, default, releases+snapshots)] -> [Help 1]
```