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

Author: dependabot[bot]

CHANGELOG.md

@@ -14,6 +14,7 @@
 - build(deps): `golang.org/x/crypto` from 0.42.0 to 0.43.0 ([#762](https://github.com/fastly/go-fastly/pull/762))
 - build(deps): `golang.org/x/sys` from 0.36.0 to 0.37.0 ([#762](https://github.com/fastly/go-fastly/pull/762))
 - build(deps): `stefanzweifel/git-auto-commit-action` from 6 to 7 ([#763](https://github.com/fastly/go-fastly/pull/763))
+- build(deps): `golangci/golangci-lint-action` from 8 to 9 ([#767](https://github.com/fastly/go-fastly/pull/767))
 
 ## [v12.1.0](https://github.com/fastly/go-fastly/releases/tag/v12.1.0) (2025-09-30)