test_logdevice: Suppress warnings in a test

power_assert warns about "this Ruby version does not support pattern matching" for versions before 3.0. This avoids issues when running the tests on those versions.

Author: olleolleolle

test/logger/test_logdevice.rb

@@ -745,7 +745,7 @@ class << Time
 
   def test_shifting_weekly_dst_change
     Dir.mktmpdir do |tmpdir|
-      assert_separately([{"TZ"=>"Europe/London"}, *%W"-I#{@top_dir} -rlogger -C#{tmpdir} -"], "#{<<-"begin;"}\n#{<<-'end;'}")
+      assert_separately([{"TZ"=>"Europe/London"}, *%W"-I#{@top_dir} -W0 -rlogger -C#{tmpdir} -"], "#{<<-"begin;"}\n#{<<-'end;'}")
       begin;
         begin
           module FakeTime
@@ -776,7 +776,7 @@ class << Time
 
   def test_shifting_monthly_dst_change
     Dir.mktmpdir do |tmpdir|
-      assert_separately([{"TZ"=>"Europe/London"}, *%W"-I#{@top_dir} -rlogger -C#{tmpdir} -"], "#{<<-"begin;"}\n#{<<-'end;'}")
+      assert_separately([{"TZ"=>"Europe/London"}, *%W"-I#{@top_dir} -W0 -rlogger -C#{tmpdir} -"], "#{<<-"begin;"}\n#{<<-'end;'}")
       begin;
         begin
           module FakeTime