DEP: Update caosdb-proto dependency

DEPENDENCIES.md

@@ -2,7 +2,7 @@
 
 ## For Building and Running the Server
 
-* `>=caosdb-proto 0.2.0`
+* `>=caosdb-proto 0.3.0`
 * `>=caosdb-mysqlbackend 5.0.0`
 * `>=Java 11`
 * `>=Apache Maven 3.6.0`

FEATURES.md

 # Features
 
-* The CaosDB Server implements a CaosDB GRPC API Endpoint (v0.2.0)
+* The CaosDB Server implements a CaosDB GRPC API Endpoint (v0.3.0)
   Authentication is supported via a Basic scheme, using the well-known
   "authentication" header.
   Notable limitations of the current implementation of the API: