chore: version bump Taskgraph 9.0.0

Author: ahal

CHANGELOG.md

@@ -1,5 +1,22 @@
 # Change Log
 
+## [9.0.0] - 2024-06-11
+
+### Added
+
+- New `taskgraph.util.copy.deepcopy` function to assist deepcopying Task objects efficiently
+- Toolchain tasks now support relative script paths
+
+### Fixed
+
+- `taskgraph.util.templates.merge` no longer attempts to merge `by-<attribute>` configs
+- Cached task digest now factors in Chain of Trust config
+- Updated `verify_routes_notification_filters` to support all valid Taskcluster values
+
+### Removed
+
+- Removed the `taskgraph.util.memoize` utility function
+
 ## [8.2.0] - 2024-05-21
 
 ### Fixed

docs/reference/migrations.rst

@@ -3,6 +3,19 @@ Migration Guide
 
 This page can help when migrating Taskgraph across major versions.
 
+8.x -> 9.x
+----------
+
+* Replace references to ``taskgraph.util.memoize.memoize`` with
+  ``functools.cache``. E.g, change ``@memoize`` to ``@cache``. If using Python
+  3.8, use ``@functools.lru_cache(maxsize=None)`` instead.
+* Pay close attention to tasks that use ``task-defaults`` to merge
+  configuration containing ``by-<attribute>`` keys. The
+  :func:`taskgraph.util.templates.merge` function will no longer attempt to merge
+  keys containing these attributes, which may result in changes to your graph.
+  You can use the :ref:`diff feature <diffing graphs>` to help detect possible
+  changes.
+
 7.x -> 8.x
 ----------
 

src/taskgraph/__init__.py

@@ -2,7 +2,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-__version__ = "8.2.0"
+__version__ = "9.0.0"
 
 # Maximum number of dependencies a single task can have
 # https://docs.taskcluster.net/reference/platform/taskcluster-queue/references/api#createTask