Log Message:
Update to 1.57

Upstream changes:
1.57   2022-03-03

- The last release would die if Sub::Util was not available, but this should
  just be an optional requirement. Fixed by Paul Howarth. GH #131.

- This is the second time I've introduced this bug, so now there's a test to
  make sure that DateTime can be loaded if Sub::Util is not
  installed. Hopefully this will prevent a third occurrence of this bug.

1.56   2022-03-02

- The DateTime->from_epoch constructor now accepts a single, non-hashref
  argument, and validates it as an epoch value. Requested by Neil Bowers. GH
  #119.