strawberry: update to 1.2.31

[slymattz]

Testing the changes

• I tested the changes in this PR: YES

cc: @voidisnull

Changelog:

Use uchardet to detect the text encoding of CUE sheets and M3U and PLS playlists [hash]2336)
...
Added a credentials manager which stores the Subsonic password in the system keyring (libsecret, KWallet, GNOME Keyring, macOS Keychain or Windows Credential Manager)

Local build testing

• I built this PR locally for my native architecture: x86_64-glibc