fix: remove usage of deprecated newInstance() method (#203)

Author: suraj-qlogic

google-cloud-logging/src/main/java/com/google/cloud/logging/LoggingConfig.java

@@ -90,7 +90,7 @@ List<LoggingEnhancer> getEnhancers() {
  Class<? extends LoggingEnhancer> clz =
  (Class<? extends LoggingEnhancer>)
  ClassLoader.getSystemClassLoader().loadClass(e_name);
- enhancers.add(clz.newInstance());
+ enhancers.add(clz.getDeclaredConstructor().newInstance());
  }
  }
  return enhancers;
@@ -122,7 +122,7 @@ private Filter getFilterProperty(String name, Filter defaultValue) {
  try {
  if (stringFilter != null) {
  Class clz = ClassLoader.getSystemClassLoader().loadClass(stringFilter);
- return (Filter) clz.newInstance();
+ return (Filter) clz.getDeclaredConstructor().newInstance();
  }
  } catch (Exception ex) {
  // If we cannot create the filter we fall back to default value
@@ -135,7 +135,7 @@ private Formatter getFormatterProperty(String name, Formatter defaultValue) {
  try {
  if (stringFilter != null) {
  Class clz = ClassLoader.getSystemClassLoader().loadClass(stringFilter);
- return (Formatter) clz.newInstance();
+ return (Formatter) clz.getDeclaredConstructor().newInstance();
  }
  } catch (Exception ex) {
  // If we cannot create the filter we fall back to default value