Bump @linearb/gitstream-core to 2.1.253

[linearbci]

https://linearb.atlassian.net/browse/LINBEE-22443

✨ PR Description

Purpose: Add sensorAuthId and headSha fields to LinearbAIContext interface to enable enhanced tracking and version control in AI-powered code analysis workflows.

Main changes:

• Extended LinearbAIContext interface with sensorAuthId and headSha fields for better context identification
• Updated getLinearbAIContext function to extract and populate new authentication and commit tracking fields
• Modified payload destructuring to include sensorAuthId and headSha from incoming webhook data

CHANGELOG

🔧 Improvements

• Enhanced AI context tracking with additional metadata for better analysis accuracy

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[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	OSS Licenses	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca