Bump @linearb/gitstream-core to 2.1.263

[linearbci]

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✨ PR Description

Purpose: Enhance error handling for Bitbucket branch deletion scenarios to properly mark workflow status and prevent false failures when branches are deleted during execution.

Main changes:

• Added BranchDeletedError exception class to distinguish branch deletion from actual failures and enable proper workflow status handling
• Updated Bitbucket commit status handler to mark deleted branch workflows as SUCCESSFUL/STOPPED instead of FAILED
• Refactored error handling flow to propagate branch deletion errors correctly and update commit status before graceful exit

CHANGELOG

🐛 Bug Fixes

• Fixed incorrect failure status when pull request branches are deleted during workflow execution

🔧 Improvements

• Improved error handling to gracefully exit when branches no longer exist

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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