Goroutine leak fixed; data-track buffering bound under congestion

Added

• added mocking function for SIP dialing methods (#4642)
• Add signal tests to test-server (#4653)
• Add option to exclude local IPv6 candidates. (#4657)
• Add a method to get forward stats via API method. (#4664)
• Add drop-on-close signal test scenario (#4669)
• Log soft validation errors. (#4671)
• add redaction flag in Job (#4650)

Changed

• simpler mock protocol (#4641)
• Make IsConnectionCanceled available at LocalParticipant interface. (#4643)
• Update actions/checkout action to v7 (#4646)
• Update protocol. (#4648)
• Export migration to LocalParticipant interface. (#4652)
• Record final RTC state as success/failure. (#4658)
• Omit rtx/out-of-order packets from forwarding delay measurement. (#4659)
• Move ForwardStats aggregation off the packet forwarding path (#4660)
• protocol deps to get parallel exec alloc reduction (#4662)
• Update pion/ice to deal with hang on close. (#4672)
• Add more details to unreliable data channel drop error. (#4673)
• Record rtc_success prom as soon as RTC connects. (#4677)
• Use proto logger to get named enums in the logs. (#4679)
• Propagate spreader threshold to RED receivers. (#4683)
• Prefer QDisc.Stats till go-tc addresses QDisc.Stats2 parsing (#4685)
• Bump protocol version to fix call to Validate. (#4686)

Fixed

• bound data-track buffering under downlink congestion (targetLatency) (#4667)
• Guard against nil TC qdisc stats to prevent SIGSEGV (#4668)
• Fix goroutine leak from orphaned signal relay streams (#4674)
• don't undercount data channel bitrate over idle gaps (#4676)
• Fix receiver load balance threshold initialization (#4678)
• rtc: guard against nil subscriber in TransportManager.HandleAnswer (#4680)
• Potential fix for code scanning alert no. 42: Incorrect conversion between integer types (#4684)