[MAINT] Remove uses of format in strings

[ndgrigorian]

This PR updates the codebase, removing uses of format instead of f strings

f strings are technically slightly faster, and are more readable

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[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[coveralls]

coverage: 77.341% (+0.003%) from 77.338% — remove-uses-of-format-for-strings into master

[antonwolfy]

LGTM