fix: note syncing toolchains

Author: rcarcasses

README.md

@@ -50,3 +50,5 @@ Releases are automated with Release Please. Conventional commits drive the next
 Once changes land on `main`, the GitHub action opens a release PR. Merging that PR tags `vX.Y.Z`, publishes the GitHub release, and the `Verify Release Tag` workflow confirms that the tag matches the version declared in `MODULE.bazel`.
 
 If you need to double-check a release manually, re-run the `Release Please` workflow from the Actions tab; it will only open a new PR when there are user-facing commits since the last tag.
+
+Use `bazel sync` after upgrading to ensure the Syft toolchain archives download for your host platform.