Update nette/tester requirement from 2.5.7 to 2.6.0

[dependabot]

Updates the requirements on nette/tester to permit the latest version.

Release notes

Sourced from nette/tester's releases.

Released version 2.6.0

This release brings true parallel test execution on Windows, smarter PHP configuration handling, and a bunch of quality-of-life improvements. The headline: Tester now respects your system php.ini by default, which is a breaking change but makes the "it works on my machine" debugging sessions a lot shorter.

Breaking Changes

• Tester now uses system php.ini by default (#465)

Improvements

• Parallel execution on Windows finally works properly – PHP 8.5's stream_select() fix means Windows users can now enjoy actual parallelism, not just the illusion of it.
• Fixed output loss on fast-exiting processes – A race condition could swallow test output when processes finished too quickly. Your test results now survive speed.

New Features

• test() and testException() lifecycle improvements – Both functions now properly call setUp() and tearDown(), and tearDown() runs even when tests fail. Your cleanup code will actually clean up.
• Added global function testNoError()

Commits

• 0d416a3 Released version 2.6.0
• 17c1a82 made static analysis mandatory
• 4fc4e95 added PHPStan baseline & fixes
• e84166e centralized cursor hiding in CliTester
• 4f452ba ConsolePrinter: removed dependency on mbstring
• ca6a1c5 ConsolePrinter: refactoring, added modes
• 6b04667 extracted Ansi class from Dumper
• a4037fa Tester uses system php.ini by default (BC break) [Closes #465]
• ff3594c added PhpInterpreter::withOption()
• d724898 added global testNoError() function
• Additional commits viewable in compare view

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[xificurk]

@dependabot squash and merge

[coveralls]

coverage: 93.75%. remained the same
when pulling 9235710 on dependabot/composer/nette/tester-2.6.0
into fc56495 on master.

[xificurk]

@dependabot rebase