Upgrade CDC from 1.7.1 to 1.9.5

- update the cdc-common, cdc-supplier and cdc-source to the latest 1.9.5.Final version.
 - adjust IT tests
 - fix minor checkstyle issues (accross all apps)

Resolves #188

Signed-off-by: Christian Tzolov <christian.tzolov@gmail.com>

functions/function/http-request-function/src/main/java/org/springframework/cloud/fn/http/request/HttpRequestFunctionConfiguration.java

@@ -23,7 +23,6 @@ import java.util.function.Function;
 import reactor.core.publisher.Flux;
 
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
-import org.springframework.boot.web.reactive.function.client.WebClientCustomizer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpHeaders;