Bump OPA version from v0.68.0 to v0.69.0 and Set new accepted minimum to v0.69.0

[github-actions]

🗣 Description

• This pull request was created by a GitHub Action to bump ScubaGear's Open Policy Agent (OPA) executable version dependency.
• Updated to also set then new minimum version to v0.69.0 for the UTF8 strip BOM if found fix.
• Updated the OPA workflow to handle update case when only a single version is found.

💭 Motivation and context

• Bump to the latest OPA version v0.69.0
• Additional in OPA fix for Fix encoding issue by removing BOM from provider output files #1302

🧪 Testing

• Currently a human should still check if bumping the OPA version affects ScubaGear.
• After importing ScubaGear Import-Module .\PowerShell\ScubaGear run Install-OPAforSCuBA to download the latest version.`
• Ran Invoke-SCuBA against a few of the tenants no issues.
• Ran OPA unit tests no issues.
• See this forked PR for how the workflow updates were tested.

📷 Screenshots

Passing unit tests.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• PR targets the correct parent branch (e.g., main or release-name) for merge.
• Changes are limited to a single goal - eschew scope creep!
• Changes are sized such that they do not touch excessive number of files.
• These code changes follow the ScubaGear content style guide.
• Related issues these changes resolve are linked preferably via closing keywords.
• All relevant type-of-change labels added.
• All relevant project fields are set.
• All relevant functional tests passed.
• All automated checks (e.g., linting, static analysis, unit/smoke tests) passed.

✅ Pre-merge checklist

• PR passed smoke test check.

• Feature branch has been rebased against changes from parent branch, as needed

  Use Rebase branch button below or use this reference to rebase from the command line.

• Resolved all merge conflicts on branch

• Notified merge coordinator that PR is ready for merge via comment mention

✅ Post-merge checklist

• Feature branch deleted after merge to clean up repository.
• Verified that all checks pass on parent branch (e.g., main or release-name) after merge.