(winscp.install) Update File Path To Not Use Get-Item/Globbing

[JPRuskin]

Description

Instead of getting a wildcarded path, we are more specific about the path to the installer we want to run.

Motivation and Context

Upgrading when multiple versions of the installer were present for whatever reason may fail unexpectedly.

Fixes #2433

How Has this Been Tested?

• Upgraded from 6.3.3 to 6.3.4 (new)
• Upgraded from 6.3.4 to 6.3.4.20240703 (patchfix)
• Tested building of regular and patchfix versions to ensure logic worked

Types of changes

• [x] Bug fix (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 change)~
• ~[ ] Migrated package (a package has been migrated from another repository)~

Checklist:

• [x] My code follows the code style of this repository.
• ~[ ] My change requires a change to documentation (this usually means the notes in the description of a package).~
• ~[ ] I have updated the documentation accordingly (this usually means the notes in the description of a package).~
• ~[ ] I have updated the package description and it is less than 4000 characters.~
• ~[ ] All files are up to date with the latest Contributing Guidelines~
• [ ] The added/modified package passed install/uninstall in the Chocolatey Test Environment(https://github.com/chocolatey-community/chocolatey-test-environment/). Note that we don't support the use of any other environment.
• [x] The changes only affect a single package (not including meta package).

[AppVeyorBot]

:white_check_mark: Package verification completed without issues. PR is now pending human review

[AppVeyorBot]

:white_check_mark: Package verification completed without issues. PR is now pending human review