Update just-import-cargo, update just dependencies, and clean up

- With the new naming convention of just-import-cargo, there is no
  longer the conflict on the file etc/defulta/rust/TARGETS.
- With the new version of the upstream rust rules, we can use the
  defaults target directly, as it fully honors TOOLCHAIN_CONFIG[RUST].
- With that simplification in place, we don't have to point
  just-import-cargo to rules-rust anymore, as for the default-imported
  rules, the TOOLCHAIN_CONFIG is honored as well.

1 files changed, 3 insertions, 0 deletions

diff --git a/etc/defaults/rust/TARGETS.cargo_import b/etc/defaults/rust/TARGETS.cargo_import
new file mode 100644
index 0000000..fe4de0a
--- /dev/null
+++ b/etc/defaults/rust/TARGETS.cargo_import
@@ -0,0 +1,3 @@
+{ "defaults":
+  {"type": "defaults", "base": [["@", "orig-rules", "rust", "defaults"]]}
+}