evg: remove workaround for missing teardown_task_can_fail_task field

.evergreen/config_generator/components/abi_stability.py

@@ -2,11 +2,12 @@
 
 from config_generator.etc.distros import find_large_distro
 from config_generator.etc.function import Function, merge_defns
-from config_generator.etc.utils import TaskGroup, bash_exec
+from config_generator.etc.utils import bash_exec
 
+from shrub.v3.evg_build_variant import BuildVariant, DisplayTask
 from shrub.v3.evg_command import EvgCommandType, git_get_project, s3_put
 from shrub.v3.evg_task import EvgTask, EvgTaskRef
-from shrub.v3.evg_build_variant import BuildVariant, DisplayTask
+from shrub.v3.evg_task_group import EvgTaskGroup
 
 
 TAG = 'abi-stability'
@@ -149,7 +150,7 @@ def tasks():
 
 def task_groups():
     return [
-        TaskGroup(
+        EvgTaskGroup(
             name=f'tg-{TAG}',
             max_hosts=-1,
             setup_group_can_fail_task=True,

.evergreen/config_generator/etc/utils.py

@@ -11,7 +11,6 @@
 from shrub.v3.evg_project import EvgProject
 from shrub.v3.shrub_service import ConfigDumper
 from shrub.v3.evg_task import EvgTaskRef
-from shrub.v3.evg_task_group import EvgTaskGroup
 from typing_extensions import get_args, get_origin, get_type_hints
 
 T = TypeVar('T')
@@ -28,17 +27,6 @@ class TaskRef(EvgTaskRef):
     batchtime: int | None = None
 
 
-# Equivalent to EvgTaskGroup but defines additional properties.
-class TaskGroup(EvgTaskGroup):
-    """
-    An evergreen task group model that also includes additional properties.
-
-    (The shrub.py model is missing some properties)
-    """
-
-    teardown_task_can_fail_task: bool | None = None
-
-
 # Automatically formats the provided script and invokes it in Bash.
 def bash_exec(
     script,

pyproject.toml

@@ -10,7 +10,7 @@ dev = [
     # .evergreen/config_generator/generate.py
     "packaging>=14.0",
     "pydantic>=2.7",
-    "shrub-py>=3.3.1",
+    "shrub-py>=3.4.0",
 
     # etc/make_release.py
     "click>=6.0",