test: switch to unordered assertions

This was caused by ffe59de

```
---- expected: tests/testsuite/registry_overlay.rs:246:27
++++ actual:   stderr
   1    1 | [UPDATING] `sparse+http://127.0.0.1:[..]/index/` index
   2    2 | [LOCKING] 3 packages to latest compatible versions
   3    3 | [ADDING] workspace-package v0.0.1 (available: v0.1.1)
   4    4 | [DOWNLOADING] crates ...
   5    5 | [UNPACKING] workspace-package v0.1.1 (registry `[ROOT]/alternative-registry`)
   6      - [DOWNLOADED] registry-package v0.1.0 (registry `sparse+http://127.0.0.1:[..]/index/`)
   7      - [DOWNLOADED] workspace-package v0.0.1 (registry `sparse+http://127.0.0.1:[..]/index/`)
        6 + [DOWNLOADED] workspace-package v0.0.1 (registry `sparse+http://127.0.0.1:51512/index/`)
        7 + [DOWNLOADED] registry-package v0.1.0 (registry `sparse+http://127.0.0.1:51512/index/`)
   8    8 | [CHECKING] workspace-package v0.1.1
   9    9 | [CHECKING] workspace-package v0.0.1
  10   10 | [CHECKING] registry-package v0.1.0
  11   11 | [CHECKING] foo v0.0.1 ([ROOT]/foo)
  12   12 | [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
```

Author: weihanglo

tests/testsuite/registry_overlay.rs

@@ -243,7 +243,8 @@ fn registry_dep_depends_on_new_local_package() {
 
     p.cargo("check")
         .overlay_registry(&reg.index_url(), &alt_path)
-        .with_stderr_data(str![[r#"
+        .with_stderr_data(
+            str![[r#"
 [UPDATING] `sparse+http://127.0.0.1:[..]/index/` index
 [LOCKING] 3 packages to latest compatible versions
 [ADDING] workspace-package v0.0.1 (available: v0.1.1)
@@ -257,7 +258,9 @@ fn registry_dep_depends_on_new_local_package() {
 [CHECKING] foo v0.0.1 ([ROOT]/foo)
 [FINISHED] `dev` profile [unoptimized + debuginfo] target(s) in [ELAPSED]s
 
-"#]])
+"#]]
+            .unordered(),
+        )
         .run();
 }