Give spring-core access to org.jboss.vfs for VfsUtils support on WildFly

This commit gives spring-core access to the org.jboss.vfs module to make
VfsUtils work out of the box on WildFly 28+.

Closes gh-30973

spring-core/spring-core.gradle

@@ -97,7 +97,7 @@ dependencies {
 }
 
 jar {
-	manifest.attributes["Dependencies"] = "jdk.unsupported"  // for WildFly (-> Objenesis 3.2)
+	manifest.attributes["Dependencies"] = "jdk.unsupported,org.jboss.vfs" // for WildFly (Objenesis and VfsUtils)
 
 	dependsOn javapoetRepackJar
 	from(zipTree(javapoetRepackJar.archiveFile)) {