Fix mock value bug in phpunit, bump phpunit 8.5

This did happen to me in Ubuntu while packaging,  until now I did not understand it correctly.
It's a phpunit bug for sure, patched in 8.5.16.
Most probably due to sebastianbergmann/phpunit#4678

```
1) PhpMyAdmin\Tests\TableTest::testDuplicateInfo
Invalid argument supplied for foreach()

libraries/classes/Table.php:944
test/classes/TableTest.php:955
phpvfscomposer://vendor/phpunit/phpunit/phpunit:60
```

Signed-off-by: William Desportes <williamdes@wdes.fr>

composer.json

@@ -105,7 +105,7 @@
         "phpstan/phpstan": "^1.4.8",
         "phpstan/phpstan-phpunit": "^1.0",
         "phpstan/phpstan-webmozart-assert": "^1.0",
-        "phpunit/phpunit": "^8.5 || ^9.5",
+        "phpunit/phpunit": "^8.5.16 || ^9.5",
         "pragmarx/google2fa-qrcode": "^2.1",
         "psalm/plugin-phpunit": "^0.16.1",
         "roave/security-advisories": "dev-latest",