Ruff: Final fix of PTH123

[kiblik]

Last iteration for builtin-open (PTH123)

[dryrunsecurity]

DryRun Security Summary

Unit test files in the unittests/tools directory were modernized by updating file opening methods to use path object .open() method instead of traditional open() function, with no security vulnerabilities detected.

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Summary: Multiple unit test files in the unittests/tools directory have been updated to use a more modern Python file opening method, replacing traditional open() function with .open() method on path objects.

Security Findings:
• No direct security vulnerabilities were introduced across the reviewed files
• All patches maintain consistent UTF-8 encoding
• Changes represent a syntax modernization with no functional security implications

No concrete security vulnerabilities were found in these patches.

View PR in the DryRun Dashboard.

[mtesauro]

Approved