My github action following DeterminateSystems/update-flake-lock@main failed this morning with the following error:

TypeError: Input does not meet YAML 1.2 "Core Schema" specification: _internal-strict-mode
Support boolean input list: `true | True | TRUE | false | False | FALSE`

This seems to come from INPUT__INTERNAL-STRICT-MODE not being set so @actions/core cannot read the value and passes an empty string to the parser which gives the above error.