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Motivation
This pull request is part of the ongoing effort described in #6305 to modernize string formatting across the Optuna codebase. Replacing str.format() with f-strings improves readability, reduces verbosity, and aligns the code with current Python best practices.
Description of the changes
Replaced a remaining instance of .format() with an equivalent f-string.
Preserved the exact behavior and message format — no functional changes.
Updated only the relevant line to keep the PR small and focused as requested in #6305.