* Upgrade Dev TCPDF to 6.5
Implementation of https://github.com/tecnickcom/TCPDF/pull/467, which is available in just-released Tcpdf 6.5, will improve look of Tcpdf rendering for PhpSpreadsheet. Fix#1164.
One test had been suppressed for Tcpdf, ostensibly because it was not compatible with Php8. As it turns out, the PhpSpreadsheet code which invokes Tcpdf was (harmlessly) incorrect, so the Php8 issue was actually with PhpSpreadsheet, not Tcpdf. That code is corrected, and the test is no longer suppressed.
* Update Change Log
Pick up some earlier changes as well as this one, and deprecations which had been omitted from the 1.24 change log.
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