Update governance page for 7 days of voting

[alamb]

Increase the time for voting in the template to 1 week, per https://community.apache.org/pmc/adding-committers.html#vote

Which issue does this PR close?

Closes #.

Rationale for this change

https://community.apache.org/pmc/adding-committers.html#vote suggests 7 days for votes

What changes are included in this PR?

Increase the time for voting in the template to 1 week, per https://community.apache.org/pmc/adding-committers.html#vote

Are these changes tested?

Just documentation

Are there any user-facing changes?

[findepi]

48h feels too short for me, so approving.
since it's project governance change, make sure you get PMC agreement on this (mailing list?)

[alamb]

48h feels too short for me, so approving. since it's project governance change, make sure you get PMC agreement on this (mailing list?)

Thank you -- this is a good call. I have done so