Bump phpunit/phpunit from 6.5.8 to 7.2.6

[dependabot-preview]

Bumps phpunit/phpunit from 6.5.8 to 7.2.6.

Changelog

Sourced from phpunit/phpunit's changelog.

Changes in PHPUnit 6.5

All notable changes of the PHPUnit 6.5 release series are documented in this file using the Keep a CHANGELOG principles.

[6.5.9] - 2018-MM-DD

Fixed

• Fixed #3142: Method-level annotations ([**backupGlobals**](https://github.com/backupGlobals), [**backupStaticAttributes**](https://github.com/backupStaticAttributes), [**errorHandler**](https://github.com/errorHandler), [**preserveGlobalState**](https://github.com/preserveGlobalState)) do not override class-level annotations

Commits

• 400a383 Prepare release
• 446091c Update ChangeLog
• 092d308 Assert::assertNotEquals - fix BC
• 6625371 Fix
• 1dbfbe2 Prepare release
• f85fdf3 Closes #3174
• 3c50bbf Merge branch '6.5' into 7.2
• d0dd8ce Ensure environment values are stored in $_ENV in \PHPUnit\Util\Configuration
• f224053 Merge branch '6.5' into 7.2
• 2a6f0aa Use more reliable curl for AppVeyor download
• Additional commits viewable in compare view

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