Upgrade to java 21 (#94)

Author: antoinebhs

.github/workflows/build.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    uses: powsybl/github-ci/.github/workflows/build-generic.yml@07ff8aa16a298b7d735d50883f6f723d84d87a55
+    uses: powsybl/github-ci/.github/workflows/build-backend-app-generic.yml@8e3547c7f6d98c23095896b6097294f22100b122
     with:
       sonarOrganization: gridsuite
       sonarProjectKey: org.gridsuite:study-notification-server

.github/workflows/patch.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   run-patch:
-    uses: powsybl/github-ci/.github/workflows/patch-generic.yml@07ff8aa16a298b7d735d50883f6f723d84d87a55
+    uses: powsybl/github-ci/.github/workflows/patch-backend-app-generic.yml@8e3547c7f6d98c23095896b6097294f22100b122
     with:
       githubappId: ${{ vars.GRIDSUITE_ACTIONS_APPID }}
       sonarOrganization: gridsuite

.github/workflows/release.yml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   run-release:
-    uses: powsybl/github-ci/.github/workflows/release-generic.yml@07ff8aa16a298b7d735d50883f6f723d84d87a55
+    uses: powsybl/github-ci/.github/workflows/release-backend-app-generic.yml@8e3547c7f6d98c23095896b6097294f22100b122
     with:
       githubappId: ${{ vars.GRIDSUITE_ACTIONS_APPID }}
       sonarOrganization: gridsuite

pom.xml

@@ -13,7 +13,7 @@
     <parent>
         <groupId>com.powsybl</groupId>
         <artifactId>powsybl-parent-ws</artifactId>
-        <version>20</version>
+        <version>21</version>
         <relativePath/>
     </parent>