MySQL does not push commits directly to GitHub. Development happens in a private repository, and Oracle periodically publishes what has been completed since the previous release. If you check the same link again in a few days (as new releases are expected soon), you should see commits covering the work done over the past few months. In short, Oracle has not abandoned MySQL.
As highlighted in the links shared by Kedar, there is a noticeable downward trend in MySQL development. At Percona, we are proposing to rebuild the MySQL Community together. If Oracle chooses not to participate, then forking becomes a viable path forward.
Oracle has delivered many valuable features in MySQL Enterprise and HeatWave (not for the community version), as shown in the comparison chart. We continuously work to enable those features in Percona products. Regardless of whether we fork, all Percona MySQL–related products (including Percona Server for MySQL, Percona XtraDB Cluster, and others) will continue to be fully supported.