New package: ocean-sound-theme v6.4.0

[axtloss]

Testing the changes

• I tested the changes in this PR: YES

New package

• This new package conforms to the package requirements: YES

Local build testing

• I built this PR locally for my native architecture, (x86_64-musl)
• I built this PR locally for these architectures (if supported. mark crossbuilds):
  • armv6l-musl (crossbuild)