test(deps): update dependency copier to v9.15.0 (main)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
copier	9.14.3 → 9.15.0

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Release Notes

copier-org/copier (copier)

v9.15.0

Compare Source

Feat

• add support for enabling StrictUndefined in Jinja environment (#​2587)

Fix

• clean up temporary clone directory when internal git clone is interrupted
• avoid double-escaping backslashes in Git paths with PathSpec v1.1.0+
• updating: propagate executable-bit changes even when Git ignores file mode changes

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