pam: update to 1.5.3.

[Bnyro]

Testing the changes

• I tested the changes in this PR: YES

Local build testing

• I built this PR locally for my native architecture, x86_64-glibc
• I built this PR locally for these architectures
  • aarch64-musl (cross)

[cinerea0]

I don't think pam is the kind of package that should only be tested "briefly". Can you provide a bit more detail on that?

[Bnyro]

I don't think pam is the kind of package that should only be tested "briefly". Can you provide a bit more detail on that?

I've been running pam 1.5.3 for two days now without any notable issues.
However, I didn't run any further tests with pam-libs in production.

musl builds seem to be broken currently anyways, so that needs further investigation.