What type of PR is this? (check all applicable)

• 🐛 Bug Fix
• ✅ Test

Description

Updates vendored concurrency libraries to include memory-retention fixes:

• Updates vendor/lua-fibers to v0.9.2.
• Updates vendor/lua-bus to v0.8.2.
• Fixes retention of timer tasks when sleep.sleep_op(...) loses a choice.
• Fixes retention of explicitly disconnected bus connections in long-lived scopes.
• Includes upstream regression coverage for both fixes.

These fixes address memory growth in common timeout and connection lifecycle paths used by devicecode services.

Manual test

• 👍 yes

Manual test description

Verified the updated vendored libraries with their relevant luajit test coverage before updating devicecode:

lua-fibers:
luajit tests/test_sleep_timer_cancel.lua
luajit tests/test_timer.lua
luajit tests/test_sleep.lua
luajit tests/test_op.lua

lua-bus:
luajit tests/test.lua

All passed.

Added tests?

• 👍 yes

Added to documentation?

• 🙅 no documentation needed