Update spring core to v6.1.9 (#270)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -60,7 +60,7 @@
     <properties>
         <jakartaee-web-api.version>10.0.0</jakartaee-web-api.version>
         <pac4j.version>6.0.3</pac4j.version>
-        <spring.version>6.1.8</spring.version>
+        <spring.version>6.1.9</spring.version>
         <aspectj.version>1.9.22.1</aspectj.version>
         <java.version>17</java.version>
         <pmdVersion>6.55.0</pmdVersion>