[Snyk] Security upgrade eslint from 6.8.0 to 9.0.0 #13

Job	Run time
Javascript	5m 42s
Client	59s
UI (0)	11m 32s
PHP (UnitTests, 7.2, PDO_MYSQL)	2m 55s
UI (1)	25m 23s
PHP (UnitTests, 8.1, MYSQLI)	2m 53s
UI (2)	25m 59s
PHP (SystemTestsPlugins, 7.2, PDO_MYSQL)	11m 9s
UI (3)	16m 29s
PHP (SystemTestsPlugins, 8.1, MYSQLI)	12m 50s
PHP (SystemTestsCore, 7.2, PDO_MYSQL)	9m 5s
PHP (SystemTestsCore, 8.1, MYSQLI)	10m 35s
PHP (IntegrationTestsCore, 7.2, PDO_MYSQL)	8m 22s
PHP (IntegrationTestsCore, 8.1, MYSQLI)	11m 48s
PHP (IntegrationTestsPlugins, 7.2, PDO_MYSQL)	22m 43s
PHP (IntegrationTestsPlugins, 8.1, MYSQLI)	24m 39s
	3h 23m 3s

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