* chore: update Java and Python dependencies

PiperOrigin-RevId: 408420890

Source-Link: googleapis/googleapis@2921f9f

Source-Link: https://github.com/googleapis/googleapis-gen/commit/6598ca8cbbf5226733a099c4506518a5af6ff74c
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* 🦉 Updates from OwlBot

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>

assign @googleapis/cdpe-cloudai as codeowner

Source-Link: googleapis/synthtool@c5026b3
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Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

* docs: update async_detect_document() sample

* docs: Update doctext sample to include method signature

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

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [x] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/python-vision/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [x] Appropriate docs were updated (if necessary)

Fixes b/203493363 🦕

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

🤖 I have created a release \*beep\* \*boop\*
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### [2.6.3](https://www.github.com/googleapis/python-vision/compare/v2.6.2...v2.6.3) (2021-12-12)


### Documentation

* Add example of how to use max_results ([#277](https://www.github.com/googleapis/python-vision/issues/277)) ([cf4dafe](https://www.github.com/googleapis/python-vision/commit/cf4dafe7c716c8091efd3bcc5a6fa5729c72fed3))
* Update doctext sample to include method signature ([#275](https://www.github.com/googleapis/python-vision/issues/275)) ([b059f3a](https://www.github.com/googleapis/python-vision/commit/b059f3a7b39a6f17c0086e18fc69776265de18d7))
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