Bump for breaking changes

pkgs/unified_analytics/pubspec.yaml

diff --git a/pkgs/unified_analytics/pubspec.yaml b/pkgs/unified_analytics/pubspec.yaml
index f88a716..d2825b8 100644
--- a/pkgs/unified_analytics/pubspec.yaml
+++ b/pkgs/unified_analytics/pubspec.yaml
@@ -5,7 +5,7 @@
 # LINT.IfChange
 # When updating this, keep the version consistent with the changelog and the
 # value in lib/src/constants.dart.
-version: 8.0.8
+version: 9.0.0
 # LINT.ThenChange(lib/src/constants.dart)
 repository: https://github.com/dart-lang/tools/tree/main/pkgs/unified_analytics
 issue_tracker: https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Aunified_analytics