Remove NIO Multipart Parser in favour of WebFlux's own parser

Closes gh-23601

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -1191,13 +1191,6 @@ bom {
 			]
 		}
 	}
-	library("NIO Multipart Parser", "1.1.0") {
-		group("org.synchronoss.cloud") {
-			modules = [
-				"nio-multipart-parser"
-			]
-		}
-	}
 	library("OAuth2 OIDC SDK", "8.22") {
 		group("com.nimbusds") {
 			modules = [

spring-boot-project/spring-boot-starters/spring-boot-starter-webflux/build.gradle

@@ -10,5 +10,4 @@ dependencies {
 	api(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-reactor-netty"))
 	api("org.springframework:spring-web")
 	api("org.springframework:spring-webflux")
-	api("org.synchronoss.cloud:nio-multipart-parser")
 }