Issue #3223997 by tim.plunkett: Allow PHP 8, Drupal 10 compatibility

composer.json

currency.info.yml

modules/currency_intl/currency_intl.info.yml

...sts/src/Unit/Plugin/Currency/AmountFormatter/IntlTest.php

modules/currency_test/currency_test.info.yml

src/Entity/Currency.php

src/Event/ResolveCountryCode.php

src/EventDispatcher.php

...src/Functional/Controller/AmountFormattingFormWebTest.php

tests/src/Functional/Controller/CurrencyLocaleWebTest.php

tests/src/Functional/Controller/CurrencyWebTest.php

tests/src/Functional/Controller/FixedRatesFormWebTest.php

...Controller/PluginBasedExchangeRateProviderFormWebTest.php

tests/src/Functional/Element/CurrencyAmountWebTest.php

tests/src/Functional/Element/CurrencySignWebTest.php

.../Functional/Entity/Currency/CurrencyDeleteFormWebTest.php

tests/src/Functional/Entity/Currency/CurrencyFormWebTest.php

...Entity/CurrencyLocale/CurrencyLocaleDeleteFormWebTest.php

...ional/Entity/CurrencyLocale/CurrencyLocaleFormWebTest.php

tests/src/Functional/Form/AmountFormattingFormWebTest.php