refactor: remove compatibility code for Yazi 0.3

mime-ext.yazi/init.lua

@@ -1060,10 +1060,6 @@ function M:setup(opts)
 end
 
 function M:fetch(job)
-	-- TODO: remove this once Yazi 0.4 is released
-	local not_v4 = not job
-	job = job or self
-
 	local opts = options()
 	local merged_files = ya.dict_merge(FILES, opts.with_files or {})
 	local merged_exts = ya.dict_merge(EXTS, opts.with_exts or {})
@@ -1089,12 +1085,11 @@ function M:fetch(job)
 
 	if next(updates) then
 		ya.manager_emit("update_mimes", { updates = updates })
-		ya.manager_emit("update_mimetype", { updates = updates }) -- TODO: remove this
 	end
 
 	if #unknown > 0 then
 		job.files = unknown
-		return not_v4 and require("mime").fetch(job) or require("mime"):fetch(job)
+		return require("mime"):fetch(job)
 	end
 
 	return 1