Update mockk to 1.12.8

Closes gh-11840

Author: Steve Riesenberg

dependencies/spring-security-dependencies.gradle

@@ -25,7 +25,7 @@ dependencies {
 		api "com.squareup.okhttp3:okhttp:3.14.9"
 		api "com.unboundid:unboundid-ldapsdk:4.0.14"
 		api "commons-collections:commons-collections:3.2.2"
-		api "io.mockk:mockk:1.12.4"
+		api "io.mockk:mockk:1.12.8"
 		api "io.projectreactor.tools:blockhound:1.0.6.RELEASE"
 		api "jakarta.inject:jakarta.inject-api:1.0.5"
 		api "jakarta.annotation:jakarta.annotation-api:1.3.5"