Update to IANA TimeZone Database 2018e

by updating:

- DateTime::TimeZone to the latest version (2.19)
  https://metacpan.org/changes/distribution/DateTime-TimeZone
  (Note: Regenerate both cpanfile.snapshot and
  docker/musicbrainz-test-database/cpanfile.snapshot on prince)

- moment-timezone to the latest version (0.5.21)
  https://github.com/moment/moment-timezone/blob/HEAD/changelog.md
  (Note: Changelog is wrong about 0.5.17, see below instead)
  moment/moment-timezone#616

cpanfile

@@ -27,7 +27,7 @@ requires 'DateTime::Format::ISO8601'                  => '0.08';
 requires 'DateTime::Format::Natural'                  => '1.02';
 requires 'DateTime::Format::Pg'                       => '0.16009';
 requires 'DateTime::Locale'                           => '1.11';
-requires 'DateTime::TimeZone'                         => '1.63';
+requires 'DateTime::TimeZone'                         => '2.19';
 requires 'DBD::Pg'                                    => '3.5.3';
 requires 'DBI'                                        => '1.63';
 requires 'DBIx::Connector'                            => '0.53';