📖 Update README slack badge (#3906)

Signed-off-by: afmarcum <[email protected]>

README.md

@@ -8,7 +8,7 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/ossf/scorecard/v4)](https://goreportcard.com/report/github.com/ossf/scorecard/v4)
 [![codecov](https://codecov.io/gh/ossf/scorecard/branch/main/graph/badge.svg?token=PMJ6NAN9J3)](https://codecov.io/gh/ossf/scorecard)
 [![SLSA 3](https://slsa.dev/images/gh-badge-level3.svg)](https://slsa.dev)
-[![Slack](https://img.shields.io/badge/slack-openssf/security_scorecards-white.svg?logo=slack)](https://slack.openssf.org/#scorecard)
+[![Slack](https://img.shields.io/badge/slack-openssf/scorecard-white.svg?logo=slack)](https://slack.openssf.org/#scorecard)
 
 <img align="right" src="artwork/openssf_security_compressed.png" width="200" height="400">