Upgrade parent to v26.1 (#202)

Signed-off-by: BOUHOURS Antoine <antoine.bouhours@rte-france.com>

Author: antoinebhs

pom.xml

@@ -15,7 +15,7 @@
     <parent>
         <groupId>com.powsybl</groupId>
         <artifactId>powsybl-parent-ws</artifactId>
-        <version>26</version>
+        <version>26.1</version>
         <relativePath/>
     </parent>