gh-100176: Tools/iobench: Remove redundant compat code for Python <= 3.2

[hugovk]

Python 3.2 has been EOL since 2016-02-20 and 2.7 since 2020-01-01, so we can remove these old compatibility checks.

https://devguide.python.org/versions/

Also use f-strings and adjust some whitespace.

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Ping also @pitrou who created this file with this note in 2010 in a69ba65:

This file should be kept compatible with both Python 2.6 and Python >= 3.0.

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• Issue: Meta issue: clean up redundant compat code #100176

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[hugovk]

See https://discuss.python.org/t/do-we-still-need-tools-io-cc-string-bench/22557 for a discussion about Tools/{io,cc,string}bench, whether to leave, modernise, move or delete them.

[AlexWaygood]

LG

[hugovk]

Let's hold off a bit merging this, we can remove the file instead:

• Meta issue: clean up redundant compat code #100176 (comment)
• https://discuss.python.org/t/do-we-still-need-tools-io-cc-string-bench/22557
• gh-100176: Remove outdated Tools/{io,cc,string}bench #101853

[hugovk]

Let's hold off a bit merging this, we can remove the file instead:

• Meta issue: clean up redundant compat code #100176 (comment)
• discuss.python.org/t/do-we-still-need-tools-io-cc-string-bench/22557
• gh-100176: Remove outdated Tools/{io,cc,string}bench #101853

No decision there in a couple of months, let's merge this. We can still remove the file later.