Update Package management files for version 2.9.1

Update change log for 2.9.1

Fix crash in clearDownloadedUpdate due to race condition of receiving delta update failure before probe status (#2863)

Configurations: Add SKIP_INSTALL=YES to for XPCServices targets (#2864)

Fix generate_appcast failing if feed URL doesn't have lastPathComponent (#2862)

Upgrade actions/checkout to version 6 (#2861)

Use inherited ARCHS for framework (#2860)

Add minimal framework support for building arm64e (#2858)

Don't let progress status text title string line wrap (#2856)

Indent test application paragraph and list items in parent list (#2854)

Update Package management files for version 2.9.0

Update change log for 2.9.0

Make generate_appcast deltas order stable and thread-safe (#2848)

Probe agent & status service as soon as we launch it (#2852)

Fix Xcode 26.4 beta compiler warnings (#2850)