Update description to mention PR due date is a week before

[wpscholar]

Proposed changes

Currently, our automated workflow that creates a milestone each week has an inaccurate description. This patch fixes the description to use the correct date that PRs should be submitted by, which is one week before the release date.

Type of Change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• Linting and tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)

Further comments

[cypress]

Bluehost Brand Plugin    Run #12350

Run Properties:   Passed #12350  •  093ebd4d4f ℹ️: Merge 950904c3a7ecbf194ac5f0eb074a17557098b9e0 into a46f5521e5adfa9dccf5129d7be0...

Project	Bluehost Brand Plugin
Branch Review	fix/milestone-workflow-pr-due-date
Run status	Passed #12350
Run duration	31m 16s
Commit	093ebd4d4f ℹ️: Merge 950904c3a7ecbf194ac5f0eb074a17557098b9e0 into a46f5521e5adfa9dccf5129d7be0...
Committer	Micah Wood
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	32
Skipped	0
Passing	411
View all changes introduced in this branch ↗︎