Begin phasing out dl.bintray.com/termux/termux-packages-24.
Before Bintray will go read-only (28 Feb), we need to ensure that
its repo has consistent state and no/minimal amount of issues as
large amount of users will continue to use it until Bintray finally
go down.
I still leaving autobuild/autodeploy (packages.yml) to Bintray repo
to process all remaining updates or pull requests with for short time.
For now script will just check package updates each 6 hours and print
them to console. Nothing will be built/pushed.
Functionality will be extended gradually.
