Update dependency google/cloud-tools to v0.12.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
google/cloud-tools	require-dev	minor	^0.8 -> 0.12.0

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Release Notes

GoogleCloudPlatform/php-tools

v0.12.0

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Features

• add support for Twig v3 (#​82)

v0.11.0

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Fixes

• Backwards-Breaking: remove deprecated app-engine-php component from gcloud install (#​83)

v0.10.0

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Features

• feat: support for Guzzle 7.x (#​80)
• feat: support for symfony/console v5 (#​79)
• feat: CloudRun gcloud wrapper (#​71)
• feat: DeploymentTrait (#​59)
• feat: install options for install_test_deps.sh script (#​67)
• feat: ability to combine backoffs (#​66)
• feat: flag in gcloud wrapper to allow for running gcloud beta (#​64)
• feat: runSnippets function to TestTrait (#​61)

Fixes

• fix: update to only use maintained versions of symfony (#​74)
• fix: only set cwd in ExecuteCommandTrait when it exists (#​78)
• fix: remove @​beforeClass from AppEngineDeploymentTrait::deployApp (#​72)
• fix: renames .php_cs to .php_cs.dist (#​62)
• test: Add PHP 7.2 and 7.3 to travis testing (#​65)

v0.9.1

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v0.9.0

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New Feature!
wp-gae tool moved into this repo for deploying WordPress to App Engine Standard (#​54)

Misc
allows latest symfony console version (#​52)
Adds RUN_CS_CHECK as a valid env var (#​53)

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