Fix compilation warning

Author: a-d

datamodel/odata-client/src/main/java/com/sap/cloud/sdk/datamodel/odata/client/request/ODataHttpRequest.java

@@ -4,6 +4,8 @@
 
 package com.sap.cloud.sdk.datamodel.odata.client.request;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.IOException;
 import java.net.URI;
 import java.util.function.Function;
@@ -25,7 +27,6 @@
 import org.apache.http.conn.ConnectionPoolTimeoutException;
 import org.apache.http.entity.StringEntity;
 
-import com.google.common.base.Charsets;
 import com.sap.cloud.sdk.datamodel.odata.client.exception.ODataConnectionException;
 import com.sap.cloud.sdk.datamodel.odata.client.exception.ODataRequestException;
 
@@ -58,7 +59,7 @@ static ODataHttpRequest forBodyJson(
         @Nonnull final HttpClient httpClient,
         @Nonnull final String json )
     {
-        final StringEntity requestBody = new StringEntity(json, Charsets.UTF_8);
+        final StringEntity requestBody = new StringEntity(json, UTF_8);
         requestBody.setContentType("application/json");
         return forHttpEntity(requestGeneric, httpClient, requestBody);
     }
@@ -68,7 +69,7 @@ static ODataHttpRequest forBodyText(
         @Nonnull final HttpClient httpClient,
         @Nonnull final String text )
     {
-        return forHttpEntity(requestGeneric, httpClient, new StringEntity(text, Charsets.UTF_8));
+        return forHttpEntity(requestGeneric, httpClient, new StringEntity(text, UTF_8));
     }
 
     static ODataHttpRequest forHttpEntity(