Upgrade to powsybl 4.3.1 (#55)

Signed-off-by: HARPER Jon <[email protected]>

Author: jonenst

pom.xml

@@ -56,7 +56,7 @@
     <properties>
         <java.version>11</java.version>
 
-        <gridsuite-dependencies.version>8</gridsuite-dependencies.version>
+        <gridsuite-dependencies.version>9</gridsuite-dependencies.version>
         <commons-lang3.version>3.9</commons-lang3.version>
 
         <sonar.coverage.jacoco.xmlReportPaths>