Backport spawnHybridUri fix for NNBD (#1374)

Backport of https://github.com/dart-lang/test/pull/1369
diff --git a/pkgs/test/CHANGELOG.md b/pkgs/test/CHANGELOG.md
index 586bf69..bca1ed1 100644
--- a/pkgs/test/CHANGELOG.md
+++ b/pkgs/test/CHANGELOG.md
@@ -54,6 +54,10 @@
   `package:test_api/test_api.dart` (and hence through
   `package:test_core/test_core.dart` and `package:test/test.dart`).
 
+## 1.15.5 (Backport)
+
+* Fix `spawnHybridUri` to respect language versioning of the spawned uri.
+
 ## 1.15.4
 
 * Allow analyzer 0.40.x.
diff --git a/pkgs/test_api/CHANGELOG.md b/pkgs/test_api/CHANGELOG.md
index 7370d4e..c4f2672 100644
--- a/pkgs/test_api/CHANGELOG.md
+++ b/pkgs/test_api/CHANGELOG.md
@@ -36,6 +36,10 @@
   `package:test_api/test_api.dart` (and hence through
   `package:test_core/test_core.dart` and `package:test/test.dart`).
 
+## 0.2.18+1 (Backport)
+
+* Fix `spawnHybridUri` to respect language versioning of the spawned uri.
+
 ## 0.2.18
 
 * Update to `matcher` version `0.12.9`.
diff --git a/pkgs/test_core/CHANGELOG.md b/pkgs/test_core/CHANGELOG.md
index 6726a5a..2a4f782 100644
--- a/pkgs/test_core/CHANGELOG.md
+++ b/pkgs/test_core/CHANGELOG.md
@@ -49,6 +49,10 @@
 
 * Migrate to null safety.
 
+## 0.3.11+2 (Backport)
+
+* Fix `spawnHybridUri` to respect language versioning of the spawned uri.
+
 ## 0.3.11+1
 
 * Allow analyzer 0.40.x.