Fix Checksum calculate() with special characters

(cherry picked from commit e9efd5a702)

ebean-ddl-generator/src/main/java/io/ebeaninternal/dbmigration/MChecksum.java

@@ -1,6 +1,7 @@
 package io.ebeaninternal.dbmigration;
 
 import java.io.*;
+import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.util.zip.CRC32;
 
@@ -13,9 +14,8 @@ class MChecksum {
    * Returns the checksum of the file. Agnostic of encoding and new line character.
    */
   static int calculate(File file) {
-    try {
+    try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(file), Charset.forName("UTF-8")))) {
       final CRC32 crc32 = new CRC32();
-      BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
       String line;
       while ((line = bufferedReader.readLine()) != null) {
         final byte[] lineBytes = line.getBytes(StandardCharsets.UTF_8);

ebean-ddl-generator/src/test/java/io/ebeaninternal/dbmigration/MChecksumTest.java

@@ -10,9 +10,9 @@ public class MChecksumTest {
 
   @Test
   public void calculate() {
-    File file = new File("src/test/resources/dbmigration/index/1.0__hello.sql");
+    File file = new File("src/test/resources/dbmigration/index-special-chars/1.0__hello.sql");
     assertThat(file).exists();
 
-    assertThat(MChecksum.calculate(file)).isEqualTo(907060870);
+    assertThat(MChecksum.calculate(file)).isEqualTo(1859426839);
   }
 }

ebean-ddl-generator/src/test/resources/dbmigration/index-special-chars/1.0__hello.sql

@@ -0,0 +1 @@
+helloäüü