Extend timeout for unstable tests

https://github.com/ruby/ruby/actions/runs/19111531630/job/54609629054

Author: k0kubun

test/ruby/test_autoload.rb

@@ -613,4 +613,10 @@ module SomeNamespace
       RUBY
     end
   end
+
+  private
+
+  def assert_separately(*args, **kwargs)
+    super(*args, **{ timeout: 60 }.merge(kwargs))
+  end
 end

test/test_extlibs.rb

@@ -10,7 +10,7 @@ def self.check_existence(ext, add_msg = nil)
     add_msg = ".  #{add_msg}" if add_msg
     log = "#{@extdir}/#{ext}/mkmf.log"
     define_method("test_existence_of_#{ext}") do
-      assert_separately([], <<-"end;", ignore_stderr: true) # do
+      assert_separately([], <<-"end;", ignore_stderr: true, timeout: 60) # do
         log = #{log.dump}
         msg = proc {
           "extension library `#{ext}' is not found#{add_msg}\n" <<