atime may not updated unless strictatime is set on macOS Catalina
Cited from mount(8):
```
strictatime
Always update the file access time when reading from a
file. Without this option the filesystem may default to a
less strict update mode, where some access time updates
are skipped for performance reasons. This option could be
ignored if it is not supported by the filesystem.
```
merge revision(s) 6333020fc924d3ae63775c032bbe8f57364cd42e:
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_5@67827 b2dd03c8-39d4-4d8f-98ff-823fe69b080e