Updates for tfc-agent release 1.22.3 (#435)

Author: kelsi-hoyle

content/terraform-docs-agents/v1.22.x/docs/cloud-docs/agents/changelog.mdx

@@ -18,6 +18,12 @@ within each release are categorized into one or more of the following labels:
 Each version below corresponds to a release artifact available for download on
 the official [releases website](https://releases.hashicorp.com/tfc-agent/).
 
+## 1.22.3 (05/27/2025)
+
+SECURITY:
+
+* Updated dependency `github.com/hashicorp/go-slug` to `v0.16.5` to resolve various vulnerabilities (#968)
+
 ## 1.22.2 (05/13/2025)
 
 BUG FIXES: