Update Helm chart images in sourcegraph-migrator to v6.9.391

Author: DaedalusG

charts/sourcegraph-migrator/values.yaml

@@ -8,7 +8,7 @@ sourcegraph:
     # -- Global docker image pull policy
     pullPolicy: IfNotPresent
     # -- Global docker image registry or prefix
-    repository: index.docker.io/sourcegraph
+    repository: us-docker.pkg.dev/sourcegraph-images/internal
     # -- When set to true, sourcegraph.image.defaultTag is used as the default defaultTag for all services, instead of service-specific default defaultTags
     useGlobalTagAsDefault: false
   # -- Mount named secrets containing docker credentials
@@ -102,7 +102,7 @@ pgsql:
 migrator:
   image:
     # -- Docker image tag for the `migrator` image
-    defaultTag: 6.0.0@sha256:ec295eb0b743da6bf56777ca6524972267a5c442b0288095e2fe12fce38ebacc
+    defaultTag: 6.9.391@sha256:86a5b3bc2061061472306ebd5776f7abdf49c0cff418ad2b4e1de471cc413e62
     # -- Docker image name for the `migrator` image
     name: "migrator"
   # -- Environment variables for the `migrator` container