fix: serialVersionUID fix for Serializable Classes (#1883)

Author: rng70-or

google-http-client/src/main/java/com/google/api/client/util/DateTime.java

@@ -292,6 +292,8 @@ public static SecondsAndNanos parseRfc3339ToSecondsAndNanos(String str) {
 
  /** A timestamp represented as the number of seconds and nanoseconds since Epoch. */
  public static final class SecondsAndNanos implements Serializable {
+ private static long serialVersionUID = 1L;
+
  private final long seconds;
  private final int nanos;
 
@@ -337,6 +339,8 @@ public String toString() {
 
  /** Result of parsing an RFC 3339 string. */
  private static class Rfc3339ParseResult implements Serializable {
+ private static final long serialVersionUID = 1L;
+
  private final long seconds;
  private final int nanos;
  private final boolean timeGiven;