We have no blockbuster packaged yet.

--- anyio-4.12.1/pyproject.toml.orig
+++ anyio-4.12.1/pyproject.toml
@@ -50,7 +50,6 @@
 
 [dependency-groups]
 test = [
-    "blockbuster >= 1.5.23",
     "coverage[toml] >= 7",
     "exceptiongroup >= 1.2.0",
     "hypothesis >= 4.18.2",
--- anyio-4.12.1/tests/test_from_thread.py.orig
+++ anyio-4.12.1/tests/test_from_thread.py
@@ -713,7 +713,6 @@
             assert exc.value.__context__ is None
 
     @pytest.mark.parametrize("portal_backend_name", get_available_backends())
-    @pytest.mark.usefixtures("deactivate_blockbuster")
     async def test_from_async(
         self, anyio_backend_name: str, portal_backend_name: str
     ) -> None:
--- anyio-4.12.1/tests/test_to_process.py.orig
+++ anyio-4.12.1/tests/test_to_process.py
@@ -71,7 +71,6 @@
     pytest.raises(LookupError, to_process._process_pool_workers.get)
 
 
-@pytest.mark.usefixtures("deactivate_blockbuster")
 async def test_cancel_during() -> None:
     """
     Test that cancelling an operation on the worker process causes the process to be