SwiftMac 2.7.5: swift 5.9 concurrency update + no more warnings

[robertmeta]

These changes only exist under swiftmac, no changes to other files in emacspeak in this set.

Some minor tweaks:

• Package.resolved added to .gitigonre
• Forked and use fork of OggDecode to make it warning free
• Caps sound now 800 50 to make it sound more unique from other tones
• ttsSyncState moved off the main actor

[tvraman]

Merged. --