Document the change in dependency coordinates with Spring Security 7

Signed-off-by: busoco-sjb <169069865+busoco-sjb@users.noreply.github.com>

Author: busoco-sjb

docs/modules/ROOT/pages/servlet/authentication/kerberos/introduction.adoc

@@ -3,3 +3,38 @@
 
 Spring Security Kerberos {spring-security-version} is built and tested with JDK 17,
 Spring Security {spring-security-version} and Spring Framework {spring-core-version}.
+
+The dependency coordinates changed with Spring Security 7:
+
+[tabs]
+======
+Maven::
++
+.pom.xml
+[source,xml,subs="verbatim,attributes"]
+----
+<dependencies>
+	<!-- ... other dependency elements ... -->
+	<dependency>
+		<groupId>org.springframework.security</groupId>
+		<artifactId>spring-security-kerberos-core</artifactId>
+	</dependency>
+	<dependency>
+		<groupId>org.springframework.security</groupId>
+		<artifactId>spring-security-kerberos-web</artifactId>
+	</dependency>
+</dependencies>
+----
+
+Gradle::
++
+.build.gradle
+[source,groovy]
+[subs="verbatim,attributes"]
+----
+dependencies {
+	implementation "org.springframework.security:spring-security-kerberos-core"
+	implementation "org.springframework.security:spring-security-kerberos-web"
+}
+----
+======