Fix netteConnector with phpunit10

[jakubvojacek]

Because of https://github.com/sebastianbergmann/phpunit/blob/main/src/TextUI/Configuration/Merger.php#L102, phpunit relies on $_SERVER['PHP_SELF']. It works fine when there's just one suite. But when there are more, the 2nd suite would fail on the line above because $_SERVER['PHP_SELF'] would be null and realpath() does not accept null.

Perhaps there is a "nicer" solution but this PR fixes the issue I was having completely.

If merged, please tag a new release if at all possible.

[coveralls]

Pull Request Test Coverage Report for Build 4351254014

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 54.857%

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Totals
Change from base Build 4269784254:	0.5%
Covered Lines:	96
Relevant Lines:	175

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💛 - Coveralls

[jakubvojacek]

possible to tag a release please @f3l1x ?

[f3l1x]

Sure, pls don't rush. :-)

https://github.com/contributte/codeception/releases/tag/v1.4.2