chore(deps): update dependency google-cloud-spanner to v3.4.0 (googleapis#330)

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | [google-cloud-spanner](https://togithub.com/googleapis/python-spanner) | `==3.3.0` -> `==3.4.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.4.0/compatibility-slim/3.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-spanner/3.4.0/confidence-slim/3.3.0)](https://docs.renovatebot.com/merge-confidence/) | --- ### Release Notes <details> <summary>googleapis/python-spanner</summary> ### [`v3.4.0`](https://togithub.com/googleapis/python-spanner/blob/master/CHANGELOG.md#&#8203;340-httpswwwgithubcomgoogleapispython-spannercomparev330v340-2021-04-29) [Compare Source](https://togithub.com/googleapis/python-spanner/compare/v3.3.0...v3.4.0) ##### Features - add samples for CMEK support ([#&#8203;275](https://www.github.com/googleapis/python-spanner/issues/275)) ([f8d9bd3](https://www.github.com/googleapis/python-spanner/commit/f8d9bd33e04675a8dca148c2fae4a9133beebbca)) - added support for numeric field for python decimal value ([#&#8203;316](https://www.github.com/googleapis/python-spanner/issues/316)) ([070a171](https://www.github.com/googleapis/python-spanner/commit/070a1712dc34afb68105194060bb2fe6177fbac5)) - **dbapi:** remove string conversion for numeric fields ([#&#8203;317](https://www.github.com/googleapis/python-spanner/issues/317)) ([772aa3c](https://www.github.com/googleapis/python-spanner/commit/772aa3c2ffbdf3f863c09db176697b3ad70adbcf)) ##### Bug Fixes - correctly set resume token when restarting streams ([#&#8203;314](https://www.github.com/googleapis/python-spanner/issues/314)) ([0fcfc23](https://www.github.com/googleapis/python-spanner/commit/0fcfc2301246d3f20b6fbffc1deae06f16721ec7)) - support INSERT from SELECT clause with args ([#&#8203;306](https://www.github.com/googleapis/python-spanner/issues/306)) ([0dcda5e](https://www.github.com/googleapis/python-spanner/commit/0dcda5e21f8fb30ee611fddf0829684d86ced0ef)) ##### Performance Improvements - use protobuf for metadata to reduce type conversions ([#&#8203;325](https://www.github.com/googleapis/python-spanner/issues/325)) ([5110b9b](https://www.github.com/googleapis/python-spanner/commit/5110b9bc31804db9777a23fca60360119840640c)) </details> --- ### Configuration :date: **Schedule**: At any time (no schedule defined). :vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied. :recycle: **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. :no_bell: **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box. --- This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/python-spanner).

Author: renovate-bot

samples/samples/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-spanner==3.3.0
+google-cloud-spanner==3.4.0
 futures==3.3.0; python_version < "3"