[TASK] Deprecate `GeneralUtility::hmac()`

In order to ensure unique HMACs in TYPO3, all usages of
`TYPO3\CMS\Core\Utility\GeneralUtility::hmac` have been
replaced with the `hmac` function in
`\TYPO3\CMS\Core\Crypto\HashService`.

This change finally deprecates `GeneralUtility::hmac()`.

Resolves: #102762
Relates: #102761
Releases: main
Change-Id: I3624ea8e2d6ec91abddfa1580ad68c1189b9445c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83462


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Benni Mack <benni@typo3.org>