fix: BCR presubmit should test the release path (#333)

Because bzlmod users get a module that doesn't have a rules_rust dep


---

### Changes are visible to end-users: no

### Test plan

- Covered by existing test cases

Author: alexeagle

.bcr/presubmit.yml

@@ -1,5 +1,5 @@
 bcr_test_module:
-  module_path: "e2e/smoke"
+  module_path: "e2e/use_release"
   matrix:
     bazel: ["7.x", "6.x"]
     # TODO(#9): add windows to this list

e2e/use_release/minimal_download_test.sh

@@ -11,7 +11,7 @@ fi
 
 # This test references pre-built artifacts from a prior release.
 # Will need to bump this version in the future when there are breaking changes.
-export RULES_PY_RELEASE_VERSION=0.7.0
+export RULES_PY_RELEASE_VERSION=0.7.3
 
 #############
 # Test bzlmod