Bylaw change: Correct elections cycles to be 8 months apart

[vdelau]

As the bylaw text states, the term were intended to be eight months apart. Starting in January (month 1), the next one should have been +8 months, bringing it to September (month 9). The May term (month 5) is correct.

Official discussion should be on the list: https://groups.google.com/g/php-fig/c/lDLfSB9NoWs

This change is subject to a vote.