Bump tonic prost dependency (#2122)

#2120 (comment)

Author: stefanvanburen

plugins/community/neoeinstein-tonic/v0.5.0/buf.plugin.yaml

@@ -4,7 +4,7 @@ plugin_version: v0.5.0
 source_url: https://crates.io/crates/protoc-gen-tonic
 description: Generates Tonic gRPC server and client code using the Prost! code generation engine.
 deps:
-  - plugin: buf.build/community/neoeinstein-prost:v0.4.0
+  - plugin: buf.build/community/neoeinstein-prost:v0.5.0
 output_languages:
   - rust
 spdx_license_id: Apache-2.0