Increase timeout for failing tests

https://github.com/ruby/ruby/actions/runs/16969921157/job/48103809963
https://github.com/ruby/ruby/actions/runs/16969655024/job/48102876839

test/io/wait/test_io_wait.rb

@@ -78,7 +78,7 @@ class TestIOWait < Test::Unit::TestCase
     ret = nil
     assert_nothing_raised(Timeout::Error) do
       q.push(true)
-      t = EnvUtil.apply_timeout_scale(0.1)
+      t = EnvUtil.apply_timeout_scale(1)
       Timeout.timeout(t) { ret = @r.wait }
     end
     assert_equal @r, ret

test/ruby/test_fiber.rb

@@ -498,7 +498,7 @@ class TestFiber < Test::Unit::TestCase
   end
 
   def test_machine_stack_gc
-    assert_normal_exit <<-RUBY, '[Bug #14561]', timeout: 10
+    assert_normal_exit <<-RUBY, '[Bug #14561]', timeout: 60
       enum = Enumerator.new { |y| y << 1 }
       thread = Thread.new { enum.peek }
       thread.join

test/ruby/test_gc.rb

@@ -293,7 +293,7 @@ class TestGc < Test::Unit::TestCase
   end
 
   def test_measure_total_time
-    assert_separately([], __FILE__, __LINE__, <<~RUBY)
+    assert_separately([], __FILE__, __LINE__, <<~RUBY, timeout: 60)
       GC.measure_total_time = false
 
       time_before = GC.stat(:time)