Found by running:
```
make pyupgrade
ruff check --fix .
ruff check --preview --unsafe-fixes --select=F401 --fix .
make format
make update-client-api-schema
```
The bulk of the changes are replacements of typing deprecated aliases
such as `Dict` and `List` with the standard library classes. These
aliases became redundant in Python 3.9 when the corresponding
pre-existing classes were enhanced to support `[]`, see
https://docs.python.org/3/library/typing.html#deprecated-aliases
Also:
- Update the `pyupgrade` Makefile target to use `--py38-plus` for the
packages needed by Pulsar, including the new galaxy-tool-util-models
package.
$ make bootstrap_test_backend
cd ../../../..; . .venv/bin/activate; python scripts/bootstrap_test_shed.py
Traceback (most recent call last):
File "/galaxy/scripts/bootstrap_test_shed.py", line 20, in <module>
from galaxy.util import requests
ModuleNotFoundError: No module named 'galaxy'
make: *** [Makefile:22: bootstrap_test_backend] Error 1
Nicola Soranzo