hydra 8.1

Version bump.

Closes #34816.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
hydra: update 8.1 bottle.
Updated dvtm to 0.13 and added very basic test.
Fixed indentation.
Test UTF-16 -> UTF-8.
Test back to UTF-16 because that's what brew's test bot wants.
dvtm: add 0.13 bottle.