Update slack action, fix typo

[karianna]

No description provided.

[Copilot]

Pull Request Overview

Updates the Slack GitHub Action to a newer version and fixes a spelling error in a comment. The PR modernizes the Slack integration while correcting documentation.

• Updates Slack GitHub Action from v1.27.0 to v2.1.1
• Fixes spelling error "uplaods" to "uploads" in OSSF scorecard workflow comment
• Modernizes Slack webhook configuration to use new parameter format

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/ossf-scorecard.yml	Fixes spelling error in comment
.github/workflows/code-freeze.yml	Updates Slack action version and configuration format

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