Update unboundid-ldapsdk to 6.0.8

Closes gh-12887

dependencies/spring-security-dependencies.gradle

@@ -23,7 +23,7 @@ dependencies {
 		api "com.nimbusds:oauth2-oidc-sdk:9.43.1"
 		api "com.squareup.okhttp3:mockwebserver:3.14.9"
 		api "com.squareup.okhttp3:okhttp:3.14.9"
-		api "com.unboundid:unboundid-ldapsdk:6.0.6"
+		api "com.unboundid:unboundid-ldapsdk:6.0.8"
 		api "commons-collections:commons-collections:3.2.2"
 		api "io.mockk:mockk:1.13.2"
 		api "io.micrometer:micrometer-observation:$micrometerVersion"