docs(CHANGELOG.md): add dependency bump from dependabot

dependabot[bot] · github-actions[bot] · commit 78452a57a910 · 2025-11-24T23:08:16.000Z
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -8,6 +8,7 @@
 - fix(service/backend): corrected a drift issue caused by the `keepalive_time` attribute ([#1156](https://github.com/fastly/terraform-provider-fastly/pull/1156))
 
 ### DEPENDENCIES:
+- build(deps): `actions/checkout` from 5 to 6 ([#1159](https://github.com/fastly/terraform-provider-fastly/pull/1159))
 
 ### DOCUMENTATION:
 
