Fix deprecations from upstream dependencies

Author: artembilan

spring-integration-sftp/src/test/java/org/springframework/integration/sftp/session/SftpServerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2022 the original author or authors.
+ * Copyright 2014-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,6 +28,7 @@
 import java.security.PublicKey;
 import java.security.spec.RSAPublicKeySpec;
 import java.util.Arrays;
+import java.util.Base64;
 import java.util.Collections;
 
 import org.apache.sshd.common.file.virtualfs.VirtualFileSystemFactory;
@@ -40,7 +41,6 @@
 import org.springframework.core.io.ByteArrayResource;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.integration.file.remote.session.Session;
-import org.springframework.util.Base64Utils;
 import org.springframework.util.FileCopyUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -121,7 +121,7 @@ private PublicKey decodePublicKey(String key) throws Exception {
 		while (keyBytes[keyBytes.length - 1] == 0x0a || keyBytes[keyBytes.length - 1] == 0x0d) {
 			keyBytes = Arrays.copyOf(keyBytes, keyBytes.length - 1);
 		}
-		byte[] decodeBuffer = Base64Utils.decode(keyBytes);
+		byte[] decodeBuffer = Base64.getDecoder().decode(keyBytes);
 		ByteBuffer bb = ByteBuffer.wrap(decodeBuffer);
 		int len = bb.getInt();
 		byte[] type = new byte[len];

spring-integration-webflux/src/test/java/org/springframework/integration/webflux/outbound/WebFluxRequestExecutingMessageHandlerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2022 the original author or authors.
+ * Copyright 2017-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 
 package org.springframework.integration.webflux.outbound;
 
+import java.nio.charset.StandardCharsets;
 import java.time.Duration;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicReference;
@@ -282,9 +283,7 @@ void testClientHttpResponseAsReply() {
 		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
 		assertThat(response.getHeaders().getContentType()).isEqualTo(MediaType.TEXT_PLAIN);
 
-		StepVerifier.create(
-						response.getBody()
-								.map(dataBuffer -> new String(dataBuffer.toByteBuffer().array())))
+		StepVerifier.create(response.getBody().map(dataBuffer -> dataBuffer.toString(StandardCharsets.UTF_8)))
 				.expectNext("foo", "bar", "baz")
 				.verifyComplete();
 	}