Fix: Remove unnecessary str() calls in logging statements

[srics96]

Issue

Several logging calls in schedule/__init__.py use str() conversion unnecessarily:

logger.debug("Running job %s", str(self))

This should be:

logger.debug("Running job %s", self)

The %s format specifier in Python's logging module already calls str() on the argument. Calling str() explicitly means the conversion happens even when the log level is disabled (e.g., when DEBUG logging is off), wasting CPU cycles.

Fix

Remove explicit str() calls from all logging statements in schedule/__init__.py where %s formatting is already used.

References

• Upstream: Don't call str() in logging calls that already use %s dbader/schedule#632 (unmerged PR)
• Minor performance improvement but good code hygiene