The latest ESXi 6.7 U3 release from the HPE site( https://www.hpe.com/us/en/servers/hpe-esxi.html ) was from March 2020.
The latest patch from VMware for ESXi 6.7U3 was AUG 2020.
Product:ESXi (Embedded and Installable) 6.7.0
Download Size:475.3 MB
When VMware releases a patch or product version, it is usually customized by the hardware manufacturers and made available only after several testing phases.
If HP has not yet released the August patch it is not VMware's problem but HP's.
As Scott says ask HP for the release notes.