Dependency on `overrides` causes crash for Python 3.14

[edrogers]

Description

Python 3.14 is scheduled to be released on Tuesday. (https://peps.python.org/pep-0745/) The dependency on overrides is a problem, as it raises an AttributeError when it is imported under Python 3.14. An issue has been raised and a pull request has been submitted to the GitHub repo for the overrides project. But the maintainer has been unresponsive.

---

Environment details

• OS type and version: Any. Verified on Linux with x86_64 architecture
• Python version: Python 3.14.0rc2
• pip version: pip 24.3.1
• google-cloud-pubsublite version: Version: 1.12.0

Steps to reproduce

git clone git@github.com:googleapis/python-pubsublite.git

cd python-pubsublite

uv venv --clear --python 3.14 && \
 uv pip install -e . && \
 uv run samples/snippets/list_lite_topics_example.py 1122334455 "us-central1" "a" True

AttributeError: module 'typing' has no attribute 'ByteString'

Code example

Above, I'm just using the list_lite_topics_example.py in this repo's samples/snippets/ directory

Stack trace

Traceback (most recent call last):
  File "/mnt/md0/home/ed/Documents/python-pubsublite/samples/snippets/list_lite_topics_example.py", line 68, in <module>
    list_lite_topics(
    ~~~~~~~~~~~~~~~~^
        args.project_number,
        ^^^^^^^^^^^^^^^^^^^^
    ...<2 lines>...
        args.regional,
        ^^^^^^^^^^^^^^
    )
    ^
  File "/mnt/md0/home/ed/Documents/python-pubsublite/samples/snippets/list_lite_topics_example.py", line 27, in list_lite_topics
    from google.cloud.pubsublite import AdminClient
  File "/mnt/md0/home/ed/Documents/python-pubsublite/google/cloud/pubsublite/__init__.py", line 119, in <module>
    from google.cloud.pubsublite.admin_client import AdminClient
  File "/mnt/md0/home/ed/Documents/python-pubsublite/google/cloud/pubsublite/admin_client.py", line 17, in <module>
    from overrides import overrides
  File "/mnt/md0/home/ed/Documents/python-pubsublite/.venv/lib/python3.14/site-packages/overrides/__init__.py", line 8, in <module>
    from overrides.overrides import __VERSION__, overrides, override
  File "/mnt/md0/home/ed/Documents/python-pubsublite/.venv/lib/python3.14/site-packages/overrides/overrides.py", line 26, in <module>
    from overrides.signature import ensure_signature_is_compatible
  File "/mnt/md0/home/ed/Documents/python-pubsublite/.venv/lib/python3.14/site-packages/overrides/signature.py", line 6, in <module>
    from .typing_utils import get_args, issubtype
  File "/mnt/md0/home/ed/Documents/python-pubsublite/.venv/lib/python3.14/site-packages/overrides/typing_utils.py", line 50, in <module>
    typing.ByteString: bytes,  # https://docs.python.org/3/library/typing.html#typing.ByteString
    ^^^^^^^^^^^^^^^^^
  File "/home/ed/.local/share/uv/python/cpython-3.14.0rc2-linux-x86_64-gnu/lib/python3.14/typing.py", line 3807, in __getattr__
    raise AttributeError(f"module {__name__!r} has no attribute {attr!r}")
AttributeError: module 'typing' has no attribute 'ByteString'