Fix prost dependencies in rust-project.json (#3663)

With this change `rust-project.json` files now correctly reference
`prost` and `tonic` as dependencies.

This fixes #3189.

Co-authored-by: Tamas Vajk <[email protected]>

Author: tamasvajk

extensions/prost/private/prost.bzl

@@ -263,7 +263,7 @@ def _rust_prost_aspect_impl(target, ctx):
                 build_info = None,
             ))
         if RustAnalyzerInfo in prost_runtime:
-            rust_analyzer_deps.append(prost_runtime[RustAnalyzerInfo].deps)
+            rust_analyzer_deps.append(prost_runtime[RustAnalyzerInfo])
         if RustAnalyzerGroupInfo in prost_runtime:
             rust_analyzer_deps.extend(prost_runtime[RustAnalyzerGroupInfo].deps)