The package installer does not show the recent versions of filesluggy. We have 1.3.4 installed, while 1.3.5 (with PHP8 compatibility, important) is the current version.
Furthermore, when you explicitly search for FileSluggy, the version schon in package management is 1.3.0 ?

MODX version: 2.8.5-pl
PHP version: 8.2.5
Maybe some settings of the uploaded package are wrong?