Update dependency jakarta.servlet:jakarta.servlet-api to v6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ jackson = "2.20"
 jakarta-activation = "1.2.2"
 jakarta-inject = "1.0.5"
 jakarta-mail = "1.6.8"
-jakarta-servlet = "4.0.4"
+jakarta-servlet = "6.1.0"
 jsr305 = "3.0.2"
 junit5 = "5.13.4"
 opensaml = "2.6.4"