openal-soft: update to 1.25.1

[jmroot]

Tested on

macOS 26.4 25E246 arm64
Xcode 26.4 17E192

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?

[macportsbot]

Notifying maintainers:
@ryandesign for port openal-soft.

[ryandesign]

Hmm, failing on macOS 14:

/opt/local/var/macports/build/openal-soft-a2861e7c/work/openal-soft-1.25.1/alc/alc.cpp:1765:27: error: no member named 'join' in namespace 'std::ranges::views'
 1765 |             | std::views::join, [](EffectSlotBase &slot)
      |               ~~~~~~~~~~~~^