That just means that the package ggtext was built using a different version of R than you have installed. I generally haven't found this to be a problem, though if you're using an outdated version of R you may run into issues with packages (for example, if a package uses the base pipe |> & you're using a version of R prior to that being added, you might run into issues).
You can see what version of R you're running with R.version()$version.string