Really remove 'Bucket._connection' bits.

Caused by googleapis#878 and googleapis#879 passing by each other simultaneously.

Bumps [cryptography](https://github.com/pyca/cryptography) from 43.0.1 to 44.0.1.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@43.0.1...44.0.1)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-type: direct:production
...

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Co-authored-by: Lingqing Gan <lingqing.gan@gmail.com>

* feat: add new v3.0.0 API skeleton (#745)

* feat: improve rows filters (#751)

* feat: read rows query model class (#752)

* feat: implement row and cell model classes (#753)

* feat: add pooled grpc transport (#748)

* feat: implement read_rows (#762)

* feat: implement mutate rows (#769)

* feat: literal value filter (#767)

* feat: row_exists and read_row (#778)

* feat: read_modify_write and check_and_mutate_row (#780)

* feat: sharded read rows (#766)

* feat: ping and warm with metadata (#810)

* feat: mutate rows batching (#770)

* chore: restructure module paths (#816)

* feat: improve timeout structure (#819)

* fix: api errors apply to all bulk mutations

* chore: reduce public api surface (#820)

* feat: improve error group tracebacks on < py11 (#825)

* feat: optimize read_rows (#852)

* chore: add user agent suffix (#842)

* feat: optimize retries (#854)

* feat: add test proxy (#836)

* chore(tests): add conformance tests to CI for v3 (#870)

* chore(tests): turn off fast fail for conformance tets (#882)

* feat: add TABLE_DEFAULTS enum for table method arguments (#880)

* fix: pass None for retry in gapic calls (#881)

* feat: replace internal dictionaries with protos in gapic calls (#875)

* chore: optimize gapic calls (#863)

* feat: expose retryable error codes to users (#879)

* chore: update api_core submodule (#897)

* chore: merge main into experimental_v3 (#900)

* chore: pin conformance tests to v0.0.2 (#903)

* fix: bulk mutation eventual success (#909)

---------

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
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Fixes googleapis/python-api-core#880

## Problem:
When the retry mechanism re-raises non-retryable exceptions, it
explicitly clears the exception chain by using raise final_exc from
None. This breaks explicit exception chaining created with raise ...
from ..., making the original cause (__cause__) inaccessible for
debugging.

## Fix:
Modified `_default_exception_factory()` in `retry_base.py` to preserve
the `__cause__` attribute when re-raising non-retryable exceptions.
Instead of returning `(exc_list[-1], None)`, we now return
`(exc_list[-1], getattr(exc_list[-1], '__cause__', None))`.

This ensures that exception chains are maintained through the retry
mechanism, preserving debugging information and meeting developer
expectations for exception handling.

## Testing:
Added a new test case in `tests/unit/retry/test_retry_base.py` that
checks that the cause from the chained exception is preserved by
`build_retry_error`.

* feat: add new v3.0.0 API skeleton (#745)

* feat: improve rows filters (#751)

* feat: read rows query model class (#752)

* feat: implement row and cell model classes (#753)

* feat: add pooled grpc transport (#748)

* feat: implement read_rows (#762)

* feat: implement mutate rows (#769)

* feat: literal value filter (#767)

* feat: row_exists and read_row (#778)

* feat: read_modify_write and check_and_mutate_row (#780)

* feat: sharded read rows (#766)

* feat: ping and warm with metadata (#810)

* feat: mutate rows batching (#770)

* chore: restructure module paths (#816)

* feat: improve timeout structure (#819)

* fix: api errors apply to all bulk mutations

* chore: reduce public api surface (#820)

* feat: improve error group tracebacks on < py11 (#825)

* feat: optimize read_rows (#852)

* chore: add user agent suffix (#842)

* feat: optimize retries (#854)

* feat: add test proxy (#836)

* chore(tests): add conformance tests to CI for v3 (#870)

* chore(tests): turn off fast fail for conformance tets (#882)

* feat: add TABLE_DEFAULTS enum for table method arguments (#880)

* fix: pass None for retry in gapic calls (#881)

* feat: replace internal dictionaries with protos in gapic calls (#875)

* chore: optimize gapic calls (#863)

* feat: expose retryable error codes to users (#879)

* chore: update api_core submodule (#897)

* chore: merge main into experimental_v3 (#900)

* chore: pin conformance tests to v0.0.2 (#903)

* fix: bulk mutation eventual success (#909)

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

* feat: Add support for python 3.11

chore: Update gapic-generator-python to v1.8.0
PiperOrigin-RevId: 500768693

Source-Link: googleapis/googleapis@190b612

Source-Link: googleapis/googleapis-gen@7bf29a4
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