Remove calls to TestCase::at

[soilSpoon]

It has been deprecated as of PHPUnit 9
So I refactor the test.

❯ ./vendor/bin/phpunit --stop-on-warning
PHPUnit 9.4.4 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.4.13
Configuration: /Users/dh/Projects/framework/phpunit.xml.dist

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....................................................W

Time: 00:00.662, Memory: 140.50 MB

There was 1 warning:

1) Illuminate\Tests\Database\DatabaseConnectionTest::testBeginTransactionMethodRetriesOnFailure
The at() matcher has been deprecated. It will be removed in PHPUnit 10. Please refactor your test to not rely on the order in which methods are invoked.

Reference

sebastianbergmann/phpunit#4297

[driesvints]

Heya, thanks for this. Can you send this to 6.x instead? PHPUnit 9 is also supported there.