Update current version to 7.13.0.Final (#1156)

Signed-off-by: fjtirado <ftirados@redhat.com>

Author: fjtirado

.github/project.yml

@@ -1,3 +1,3 @@
 release:
-  current-version: 7.12.1.Final
+  current-version: 7.13.0.Final
   next-version: 8.0.0-SNAPSHOT

impl/README.md

@@ -103,6 +103,9 @@ This SDK is modular by design—pull in only what you need:
 * **serverlessworkflow-impl-openapi**
   OpenAPI support
 
+* **serverlessworkflow-impl-grpc**
+  gRPC support
+  
 * **serverlessworkflow-impl-script-python**
   Python support