Update cas-server-webapp to 4.0.7

Did not update to the latest as there is some work involved in
aligning the casserver sample's XML configuration with the latest
cas-server-webapp.

Fixes gh-7874

gradle/dependency-management.gradle

@@ -85,7 +85,7 @@ dependencies {
 		management "org.hibernate:hibernate-validator:6.+"
 		management "org.hsqldb:hsqldb:2.+"
 		management "org.jasig.cas.client:cas-client-core:3.+"
-		management "org.jasig.cas:cas-server-webapp:4.0.0@war"
+		management "org.jasig.cas:cas-server-webapp:4.0.7@war"
 		management "org.mockito:mockito-core:3.+"
 		management "org.openid4java:openid4java-nodeps:0.+"
 		management "org.opensaml:opensaml-core:$openSamlVersion"

samples/xml/cas/casserver/spring-security-samples-xml-casserver.gradle

@@ -4,7 +4,7 @@ def keystore = "$rootDir/samples/certificates/server.jks"
 def password = 'password'
 
 dependencies {
-	compile "org.jasig.cas:cas-server-webapp:4.0.0@war"
+	compile "org.jasig.cas:cas-server-webapp:4.0.7@war"
 	compile slf4jDependencies
 	runtime 'org.aspectj:aspectjrt'
 	runtime 'org.aspectj:aspectjtools'