chore: release 2.6.0 (googleapis#337)

🤖 I have created a release \*beep\* \*boop\*
---
## [2.6.0](https://www.github.com/googleapis/python-logging/compare/v2.5.0...v2.6.0) (2021-07-28)


### Features

* add always_use_jwt_access ([googleapis#334](https://www.github.com/googleapis/python-logging/issues/334)) ([ae67d10](https://www.github.com/googleapis/python-logging/commit/ae67d10a661a3561b366bb05f5cf6d34520164b4))


### Bug Fixes

* **deps:** pin 'google-{api,cloud}-core', 'google-auth' to allow 2.x versions ([googleapis#356](https://www.github.com/googleapis/python-logging/issues/356)) ([a970dd2](https://www.github.com/googleapis/python-logging/commit/a970dd293d4fddc983946cb1c362f487a82d9609))
* disable always_use_jwt_access ([googleapis#342](https://www.github.com/googleapis/python-logging/issues/342)) ([a95e401](https://www.github.com/googleapis/python-logging/commit/a95e40188c9483310fb1dce9242c7c66721a6b7f))
* enable self signed jwt for grpc ([googleapis#360](https://www.github.com/googleapis/python-logging/issues/360)) ([707fad1](https://www.github.com/googleapis/python-logging/commit/707fad1a714d951727336b03f4444f53199737e3))


### Documentation

* omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#1127](https://www.github.com/googleapis/python-logging/issues/1127)) ([googleapis#327](https://www.github.com/googleapis/python-logging/issues/327)) ([faa6fb9](https://www.github.com/googleapis/python-logging/commit/faa6fb9a86c82b99b529e979160bfdd7a505793b)), closes [#1126](https://www.github.com/googleapis/python-logging/issues/1126)
* add Samples section to CONTRIBUTING.rst ([googleapis#357](https://www.github.com/googleapis/python-logging/issues/357)) ([8771716](https://www.github.com/googleapis/python-logging/commit/8771716cae7cf67d710b3741b8b718fc4a8aa2b6))
---


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chore: release 2.5.0 (googleapis#320)

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chore: release 2.4.0 (googleapis#294)

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chore: release 2.3.1 (googleapis#240)

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chore: release 2.3.0 (googleapis#205)

chore: release 2.2.0 (googleapis#163)

chore: release 2.1.1 (googleapis#157)

chore: release 2.1.0 (googleapis#138)

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chore: release 2.0.2 (googleapis#116)

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chore: release 2.0.1 (googleapis#101)