dataset-collector: remove unstable feature

dataset-collector/src/main.rs

@@ -1,5 +1,3 @@
-#![feature(iterator_try_collect)]
-
 use anyhow::Result;
 use clap::Parser;
 

dataset-collector/src/solvefailed.rs

@@ -25,7 +25,7 @@ pub async fn run(args: Args) -> Result<()> {
     let files = args
         .output
         .read_dir()?
-        .try_collect::<Vec<_>>()?
+        .collect::<Result<Vec<_>, std::io::Error>>()?
         .into_iter()
         .filter(|e| e.file_name().to_str().unwrap().starts_with("FFFF_"))
         .map(|e| e.path())