fix(buckets|scoop-info): Switch git log date format to ISO 8601 to avoid locale issues

[z-Fng]

Motivation and Context

• Closes [Bug] info command with "-" char in package name #6429
• Closes [Bug] Get-Date issue when running scoop export #6607

Description

git log -1 --format='%aD' | Get-Date

git log -1 --format='%aI' | Get-Date

Passing an RFC2822-formatted (%aD) time string to Get-Date may result in parsing failures depending on the system locale.

Switching to ISO 8601 format (%aI) ensures consistent parsing across all regions, as it uses a standardized format like 2025-08-12T08:02:16+02:00.

See also:

• git/git@466fb67
• https://git-scm.com/docs/git-log#Documentation/git-log.txt-aI
• https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/get-date?view=powershell-5.1#description

Checklist:

• I have read the Contributing Guide.
• I have ensured that I am targeting the develop branch.
• I have updated the documentation accordingly.
• I have updated the tests accordingly.
• I have added an entry in the CHANGELOG.