This commit was cherry-picked from Fedora rawhide
<f8ef5964d0>.
This fixes the test failures related to the Singapore time zone like below.
```
2) Failure:
TestTimeTZ#test_asia_singapore [/builddir/build/BUILD/ruby-3.0.4/test/ruby/test_time_tz.rb:143]:
TZ=Asia/Singapore Time.local(1981, 12, 31, 23, 59, 59).
<"1981-12-31 23:59:59 +0730"> expected but was
<"1982-01-01 00:29:59 +0800">.
```
Related: rhbz#2173531
