Upgrade to SSHD 2.9.3

* Fix `SftpRemoteFileTemplateTests` according to new SSHD requirements (restrictions?)

build.gradle

@@ -47,7 +47,7 @@ ext {
     modifiedFiles =
             files(grgit.status().unstaged.modified).filter { f -> f.name.endsWith('.java') || f.name.endsWith('.kt') }
 
-    apacheSshdVersion = '2.9.2'
+    apacheSshdVersion = '2.9.3'
     artemisVersion = '2.28.0'
     aspectjVersion = '1.9.20.1'
     assertjVersion = '3.24.2'

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2023 the original author or authors.
+ * Copyright 2014-2024 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.
@@ -71,14 +71,14 @@ public void testINT3412AppendStatRmdir() {
 		fileNameGenerator.setExpression("'foobar.txt'");
 		fileNameGenerator.setBeanFactory(mock(BeanFactory.class));
 		template.setFileNameGenerator(fileNameGenerator);
-		template.setRemoteDirectoryExpression(new LiteralExpression("foo/"));
+		template.setRemoteDirectoryExpression(new LiteralExpression("/foo/"));
 		template.setUseTemporaryFileName(false);
 		template.setBeanFactory(mock(BeanFactory.class));
 		template.afterPropertiesSet();
 
 		template.execute(session -> {
-			session.mkdir("foo/");
-			return session.mkdir("foo/bar/");
+			session.mkdir("/foo");
+			return session.mkdir("/foo/bar");
 		});
 		template.append(new GenericMessage<>("foo"));
 		template.append(new GenericMessage<>("bar"));
@@ -93,17 +93,17 @@ public void testINT3412AppendStatRmdir() {
 			}
 		});
 		template.execute((SessionCallbackWithoutResult<SftpClient.DirEntry>) session -> {
-			SftpClient.DirEntry[] files = session.list("foo/");
+			SftpClient.DirEntry[] files = session.list("/foo");
 			assertThat(files.length).isEqualTo(4);
-			assertThat(session.remove("foo/foobar.txt")).isTrue();
-			assertThat(session.rmdir("foo/bar/")).isTrue();
-			files = session.list("foo/");
+			assertThat(session.remove("/foo/foobar.txt")).isTrue();
+			assertThat(session.rmdir("/foo/bar")).isTrue();
+			files = session.list("/foo");
 			assertThat(files.length).isEqualTo(2);
 			List<String> fileNames = Arrays.stream(files).map(SftpClient.DirEntry::getFilename).toList();
 			assertThat(fileNames).contains(".", "..");
-			assertThat(session.rmdir("foo/")).isTrue();
+			assertThat(session.rmdir("/foo")).isTrue();
 		});
-		assertThat(template.exists("foo")).isFalse();
+		assertThat(template.exists("/foo")).isFalse();
 	}
 
 	@Test