Remove full stop from bytes syntaxerror message

[numbermaniac]

Every other error I've seen raised by Python doesn't have a full stop at the end. This one appears to be an anomaly, so this PR removes the full stop to make it consistent with other errors.

[the-knights-who-say-ni]

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[numbermaniac]

The "requested review" was automatic, I didn't do it myself. I hope I haven't accidentally bothered anyone unnecessarily with that!

[pablogsal]

Thanks for the catch @numbermaniac !