Update src/test/java/com/redhat/cloud/common/clowder/configsource/Con…

…figSourceTest.java

Co-authored-by: Gwenneg Lepage <gwenneg@users.noreply.github.com>

src/test/java/com/redhat/cloud/common/clowder/configsource/ConfigSourceTest.java

@@ -881,7 +881,7 @@ private static String readFile(String filename) {
         InputStream is = ConfigSourceTest.class.getResourceAsStream(filename);
 
         try {
-            return new String(is.readAllBytes());
+            return new String(is.readAllBytes(), UTF_8);
         } catch (IOException ex) {
             Assertions.fail("File '" + filename + "' not found!");
             return null;