Update logback-classic to 1.2.6

Closes gh-10282

Author: rwinch

dependencies/spring-security-dependencies.gradle

@@ -16,7 +16,7 @@ dependencies {
 	api platform("org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.5.1")
 	api platform("com.fasterxml.jackson:jackson-bom:2.12.4")
 	constraints {
-		api "ch.qos.logback:logback-classic:1.2.5"
+		api "ch.qos.logback:logback-classic:1.2.6"
 		api "com.google.inject:guice:3.0"
 		api "com.nimbusds:nimbus-jose-jwt:9.11.3"
 		api "com.nimbusds:oauth2-oidc-sdk:9.12"