Are there plans for core software update?

Just curious what are the plans for updating the now unsupported php7.3 and isc-dhcp?

Had to list software for our configuration register and freshly installed UCS5.0 server went on risk register at the same time.

afaik they are still supported and patched by debian

For php7.3 support ended a while back and so did the security patching period:

Same for the isc-dhcp:

Seems to be so.
PHP on UCS 5.05:

PHP 7.3.31-1~deb10u5 (cli) (built: Sep  4 2023 21:49:25)