Bump cas-server-core-web from 6.2.8 to 6.4.2 in /buession-cas-parent

Bumps [cas-server-core-web](https://github.com/apereo/cas) from 6.2.8 to 6.4.2.
- [Release notes](https://github.com/apereo/cas/releases)
- [Commits](apereo/cas@v6.2.8...v6.4.2)

---
updated-dependencies:
- dependency-name: org.apereo.cas:cas-server-core-web
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

buession-cas-parent/pom.xml

@@ -77,7 +77,7 @@
 		<buession.version>2.1.2</buession.version>
 		<buession.security.version>2.1.2</buession.security.version>
 		<buession.springboot.version>2.1.2</buession.springboot.version>
-		<cas.version>6.3.7.4</cas.version>
+		<cas.version>6.4.2</cas.version>
 	</properties>
 
 	<dependencyManagement>