chore: fix phpstan error for `$credentials` · codeigniter4/shield@93e3c71

Took 0.77s from 0.50s limit to run Tests\\Unit\\UserIdentityModelTest::testForceMultiplePasswordReset

Took 0.70s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisterActionSuccessWithNoEmailLogin

Took 0.69s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisteredButNotActivatedAndLogin

Took 0.69s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisteredButNotActivatedAndRegisterAgain

Took 0.68s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisteredAndSessionExpiredAndLogin

Took 0.68s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisterActionSuccess

Took 0.68s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisterRedirectsToActionIfDefined

Took 0.66s from 0.50s limit to run Tests\\Controllers\\RegisterTest::testRegisterActionWithBadEmailValue

Took 0.56s from 0.50s limit to run Tests\\Unit\\DictionaryValidatorTest::testCheckTrueOnNotFound

Took 0.55s from 0.50s limit to run Tests\\Unit\\PasswordsTest::testHash

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