bazel_6: 6.0.0 -> 6.1.0
Updating the updater script:
- `//external:all` -> `//external:*` to make it work with recent bazel versions
Avoiding chicken-egg problem by explicitly asking to first build previous version,
then update sources version, then use updater and previous version to update src-deps.
`bazel_self` may not necessarily build out of the box after just the sources version
bump and may depend on updater being run first, which can't run without `bazel_self`.
So listing steps to use old version to help updating to new version