phpunit.xml.dist - Update extensions to use phpunit9 format

[totten]

Overview

Since we're switch the core extensions to run tests on phpunit9 (civicrm/civicrm-buildkit#811), we should also update format.

cc @seamuslee001

Before

[bknix-min:~/bknix/build/dmaster/web/sites/all/modules/civicrm/ext/financialacls] phpunit9 
PHPUnit 9.6.5 by Sebastian Bergmann and contributors.

Warning:       Your XML configuration validates against a deprecated schema.
Suggestion:    Migrate your XML configuration using "--migrate-configuration"!

After

Quiet

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[totten]

Since #811 was just merged, it may take a moment before it rolls out. Based on some spot-checking, I'd expect these files to work either way (with phpunit8 or phpunit9) - but phpunit8 would show some opposite warnings on the console.

[seamuslee001]

Jenkins retest this please

[colemanw]

Retest this please