fix: 🐛 set sas_path target to mode = "always" to detect new SAS files in input_dir (#233)

# Description

I experienced that after adding more SAS files to the input_dir, the new
files weren't converted. This fixes that.
Not sure how often this would happen though?

Needs a thorough review.

## Checklist

- [X] Ran `just run-all`

Author: signekb

inst/template-targets.R

@@ -62,7 +62,8 @@ list(
   tar_target(
     name = sas_paths,
     command = list_sas_files(config$input_dir),
-    deployment = "main"
+    deployment = "main",
+    cue = tar_cue(mode = "always")
   ),
 
   # Empty output directory before writing to avoid outdated Parquet files.