There is an announcement at https://cran.r-project.org/

Dear users,

The CRAN Admin Team will perform system upgrades during the period Wednesday November 15 until Thursday November 16, 2023.
There will be intermittent outages in service during this time.
We thank you for your understanding and apologise for any inconvenience this may cause.

CRAN Admin Team

This may effect BiocManager and the ability to download/install packages. We appreciate your patience and understanding during the CRAN update period.