Update org.springframework to 5.3.8

Closes gh-9984

dependencies/spring-security-dependencies.gradle

@@ -7,7 +7,7 @@ javaPlatform {
 }
 
 dependencies {
-	api platform("org.springframework:spring-framework-bom:5.3.7")
+	api platform("org.springframework:spring-framework-bom:5.3.8")
 	api platform("io.projectreactor:reactor-bom:2020.0.7")
 	api platform("io.rsocket:rsocket-bom:1.1.1")
 	api platform("org.springframework.data:spring-data-bom:2021.0.1")