enable releases

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| com.diffplug.eclipse.apt | `3.36.0` -> `3.36.1` | [![age](https://badges.renovateapi.com/packages/maven/com.diffplug.eclipse.apt/3.36.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.diffplug.eclipse.apt/3.36.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.diffplug.eclipse.apt/3.36.1/compatibility-slim/3.36.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.diffplug.eclipse.apt/3.36.1/confidence-slim/3.36.0)](https://docs.renovatebot.com/merge-confidence/) |

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This is a technically a breaking change for gax-httpjson, but httpjson is not GA yet. This change is not breaking for DIREGAPIC or REGAPIC, as none of those project (including compute client in particular) was dependend on ApiMessage.

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| com.diffplug.eclipse.apt | `3.36.1` -> `3.36.2` | [![age](https://badges.renovateapi.com/packages/maven/com.diffplug.eclipse.apt/3.36.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.diffplug.eclipse.apt/3.36.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.diffplug.eclipse.apt/3.36.2/compatibility-slim/3.36.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.diffplug.eclipse.apt/3.36.2/confidence-slim/3.36.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Configuration

📅 **Schedule**: At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

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🤖 I have created a release *beep* *boop*
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### Updating meta-information for bleeding-edge SNAPSHOT release.

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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

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Null response should not ever happen, but apparently it is possible in cases when errors occur somewhere on network/authentication level

* ci: java8 build with java11 compilation

* ci: build script to distinguish JDK 11 and JDK 8

* build: javac to take '--release 8' flag

* ci: fail build if Java 8 is not specified for junit-java8

🤖 I have created a release *beep* *boop*
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## [2.17.0](v2.16.0...v2.17.0) (2022-05-10)


### Features

* next release from main branch is 2.17.0 ([#1659](#1659)) ([5a31361](5a31361))


### Bug Fixes

* Fix handling of null responses in rest transport ([#1668](#1668)) ([8def947](8def947))
* use graal-sdk 21.3.2 ([#1670](#1670)) ([92c2697](92c2697))

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