fix(mcp): upgrade Spring Boot to 4.0.0 in brave-chatbot

Resolves ClassNotFoundException for RetryTemplate (#86)
caused by Spring AI 2.0.0-SNAPSHOT requirements.

Signed-off-by: Kushal.Sharma1 <kushal.sharma1@dpwrold.com>

Author: Kushal.Sharma1

model-context-protocol/web-search/brave-chatbot/pom.xml

@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.4.5</version>
+		<version>4.0.0</version>
 		<relativePath /> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>com.example</groupId>