fix: fix string formatting in version warning message

[PythonicVarun]

Fixed, variables interpolation in version warning message:

kaggle-cli/src/kaggle/api/kaggle_api_extended.py

Lines 5325 to 5327 in 54dc103

	f"Warning: Looks like you're using an outdated `kaggle`` "
	"version (installed: {current_version}), please consider "
	"upgrading to the latest version ({latest_version_str})"

Before:

Warning: Looks like you're using an outdated `kaggle`` version (installed: {current_version}), please consider upgrading to the latest version ({latest_version_str})

After:

Warning: Looks like you're using an outdated `kaggle` version (installed: 1.8.3), please consider upgrading to the latest version (1.8.4)

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.