bump core to 6.7.0-RC1

Signed-off-by: Didier Vidal <didier.vidal_externe@rte-france.com>

Author: vidaldid-rte

pom.xml

@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-
-    Copyright (c) 2019, RTE (http://www.rte-france.com)
-    This Source Code Form is subject to the terms of the Mozilla Public
-    License, v. 2.0. If a copy of the MPL was not distributed with this
-    file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
--->
+  Copyright (c) 2019-2025, RTE (http://www.rte-france.com)
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+  SPDX-License-Identifier: MPL-2.0
+  -->
 <project xmlns="http://maven.apache.org/POM/4.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
@@ -54,7 +53,7 @@
         <slf4jtoys.version>1.6.3</slf4jtoys.version>
         <asciitable.version>0.3.2</asciitable.version>
 
-        <powsybl-core.version>6.7.0-SNAPSHOT</powsybl-core.version>
+        <powsybl-core.version>6.7.0-RC1</powsybl-core.version>
     </properties>
 
     <build>