Try and add the jramke/tailwind-styled-content package to your site package composer.json - this will ensure that the dependency order is correct.
Despite that, the package you referring to, does not have a “Site set” that you can require from your own site package (not all have that). So remove that dependency from you config.yaml.
So instead, you must include the typoscript directly by having the following in your setup.typoscript
@import 'EXT:tailwind_styled_content/Configuration/TypoScript/setup.typoscript'
and similar in constants.typoscript
@import 'EXT:tailwind_styled_content/Configuration/TypoScript/constants.typoscript'