Patch release: 1.6.3

[aignas]

What version of rules_python do you want to patch?

1.6.1

What pull requests do you want to backport?

Please provide a list of pull request numbers.

• fix(pypi): select the lowest available libc version by default #3255

The 1.6.2 has been aborted due to the cherry pick being incomplete.

[aignas]

Done, new tag pushed