Upgrade to Spring Security 6.1.9

Closes gh-1007

Author: bclozel

platform/build.gradle

@@ -13,7 +13,7 @@ dependencies {
 	api(platform("io.micrometer:micrometer-bom:1.11.12"))
 	api(platform("io.micrometer:micrometer-tracing-bom:1.1.13"))
 	api(platform("org.springframework.data:spring-data-bom:2023.0.12"))
-	api(platform("org.springframework.security:spring-security-bom:6.1.7"))
+	api(platform("org.springframework.security:spring-security-bom:6.1.9"))
 	api(platform("com.querydsl:querydsl-bom:5.0.0"))
 	api(platform("io.rsocket:rsocket-bom:1.1.4"))
 	api(platform("org.jetbrains.kotlin:kotlin-bom:${kotlinVersion}"))