[backend] Update opensaml.version to v5

Author: renovate[bot]

openbas-api/pom.xml

@@ -17,7 +17,7 @@
         <bcpg-jdk18on.version>1.80</bcpg-jdk18on.version>
         <commons-collections4.version>4.5.0</commons-collections4.version>
         <commons-email.version>1.5</commons-email.version>
-        <opensaml.version>4.3.2</opensaml.version>
+        <opensaml.version>5.1.4</opensaml.version>
         <springdoc.version>2.6.0</springdoc.version>
         <springdoc-plugin.version>1.4</springdoc-plugin.version>
         <cron-utils.version>9.2.1</cron-utils.version>