Adding regression3 to Travis.

* chore(deps): update all dependencies

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

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

* chore(deps): update all dependencies

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

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

* chore(deps): update all dependencies

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

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

---------

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

Initial conversion to Github Actions for CI

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Co-authored-by: Anthonios Partheniou <partheniou@google.com>