Hello,
it is time to mark the end of official packaging for 5.3.x releases, therefore during the next days I am going to cut the v5.3.9 release from branch 5.3, likely on Wednesday, Dec 8, 2021.
In other words, if no major regression is detected shortly after this release, the v5.3.9 is going to be the last one from the 5.3 branch.
It is strongly recommended to move to a series that is under active maintenance, respectively 5.5.x or 5.4.x.
Cheers, Daniel