Upgrade to Spring Framework 5.3.30

Closes gh-799

Author: bclozel

platform/build.gradle

@@ -9,7 +9,7 @@ javaPlatform {
 dependencies {
 	api(platform("com.fasterxml.jackson:jackson-bom:2.13.5"))
 	api(platform("io.projectreactor:reactor-bom:2020.0.36"))
-	api(platform("org.springframework:spring-framework-bom:5.3.26"))
+	api(platform("org.springframework:spring-framework-bom:5.3.30"))
 	api(platform("org.springframework.data:spring-data-bom:2021.2.10"))
 	api(platform("org.springframework.security:spring-security-bom:5.7.7"))
 	api(platform("com.querydsl:querydsl-bom:5.0.0"))