[MERGE] Update for TYPO3 13.4

[FamousWolf]

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[imminger]

Hint:
Using HashService::hmac() with a placeholder secret ('changeMe') instead of GeneralUtility::hmac() in AuthCodeUtility breaks backward compatibility for newsletters sent with TYPO3 12. Old newsletter links can no longer be resolved.

The migration to HashService::hmac() introduced a BC break because it requires a non-empty additionalSecret, which changes the resulting HMAC. Newsletter links generated under TYPO3 v12 used HMACs without an additional secret, so their auth codes fail validation in TYPO3 v13.

Note:
GeneralUtility::hmac() is deprecated and will be removed in TYPO3 v14.