Fix tarball uri generation

src/flake.rs

@@ -76,11 +76,6 @@ pub fn assemble_flake_tarball_uri(flake_source: &FlakeSource) -> Result<String>
     out.push_str(&flake_source.url.clone()
         .context("Flake tarball uri does not contain an url")?);
 
-    if let Some(rev) = &flake_source.rev {
-        out.push_str("?rev=");
-        out.push_str(rev);
-    }
-
     Ok(out)
 }