Remove unnecessary spring-boot-http-converter dependency

Remove unnecessary spring-boot-http-converter dependency from
`spring-boot-actuator`.

See gh-46357

Author: philwebb

module/spring-boot-actuator/build.gradle

@@ -28,7 +28,6 @@ dependencies {
 	api(project(":core:spring-boot"))
 
 	optional(project(":module:spring-boot-health"))
-	optional(project(":module:spring-boot-http-converter"))
 	optional("com.github.ben-manes.caffeine:caffeine")
 	optional("com.google.code.findbugs:jsr305")
 	optional("com.zaxxer:HikariCP")