style: Fix code formatting with spotless

- Apply spotless formatting to Java files
- Fix line breaks and spacing issues
- Ensure code style compliance

Author: kentoyoshida

src/main/java/org/embulk/output/SnowflakeOutputPlugin.java

@@ -278,9 +278,7 @@ public ConfigDiff transaction(
                     s3SecretAccessKey.orElse(null))) {
               String tmpDir = System.getProperty("java.io.tmpdir", "/tmp");
               File logDir = new File(tmpDir);
-              File[] logFiles =
-                  logDir.listFiles(
-                      (dir, name) -> name.startsWith("snowflake_jdbc"));
+              File[] logFiles = logDir.listFiles((dir, name) -> name.startsWith("snowflake_jdbc"));
               if (logFiles != null && logFiles.length > 0) {
                 Optional<File> latest =
                     Arrays.stream(logFiles).max(Comparator.comparingLong(File::lastModified));

src/main/java/org/embulk/output/s3/JdbcLogUploader.java

@@ -55,7 +55,7 @@ public void uploadIfExists(File file) {
     String timestamp = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss"));
     String originalFileName = file.getName();
     String fileNameWithTimestamp;
-    
+
     // Insert timestamp before file extension
     int lastDotIndex = originalFileName.lastIndexOf('.');
     if (lastDotIndex > 0) {
@@ -65,7 +65,7 @@ public void uploadIfExists(File file) {
     } else {
       fileNameWithTimestamp = originalFileName + "_" + timestamp;
     }
-    
+
     String key = prefix.isEmpty() ? fileNameWithTimestamp : prefix + "/" + fileNameWithTimestamp;
     try {
       PutObjectRequest putObjectRequest =