rebase Signal patch set on upstream 4.6.3

Update Alpine to 3.21.1 version in Docker image

Upgrade Docker image to 4.6.3 Coturn version

Upgrade Alpine to 3.21 version in Docker image

Add a metric to track create_permission responses by code

Revert "accept but ignore permissions to forbidden IPs"

merge from upstream

Update Alpine to 3.20.3 version in Docker image to fix CVE-2024-6119

Update Alpine to 3.20.2 version to fix CVE-2024-5535 in Docker image

same as 4.6.2n