Fix tests to cope with updates in tzdata

Fix tests to cope with updates in tzdata

Backported-by: Antonio Terceiro <terceiro@debian.org>
See https://bugs.ruby-lang.org/issues/14438

This is a backport of the following two commits from Ruby upstream:

test_time_tz.rb: past Japanese DST tzdata fix

* test/ruby/test_time_tz.rb (TestTimeTZ#test_asia_tokyo): follow
  the tzdata 2018 fix of Japanese DST transitions (1948-1951).
  [ruby-core:85373] [Bug #14438]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62506 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test_time_tz.rb: past Japanese DST tzdata fix

* test/ruby/test_time_tz.rb (TestTimeTZ#test_asia_tokyo): fix
  the expected data at the end of DST.  [Bug #14438]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62508 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Gbp-Pq: Name 0005-Fix-tests-to-cope-with-updates-in-tzdata.patch