Bump package versions to 0.3 (#274)

Author: nnmm

rosidl_generator_rs/package.xml

@@ -2,7 +2,7 @@
 <?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
 <package format="3">
   <name>rosidl_generator_rs</name>
-  <version>0.2.0</version>
+  <version>0.3.0</version>
   <description>Generate the ROS interfaces in Rust.</description>
   <maintainer email="esteve@apache.org">Esteve Fernandez</maintainer>
   <license>Apache License 2.0</license>

rosidl_generator_rs/resource/Cargo.toml.em

@@ -5,7 +5,7 @@ edition = "2021"
 
 [dependencies]
 libc = "0.2"
-rosidl_runtime_rs = "*"
+rosidl_runtime_rs = "0.3"
 serde = { version = "1", optional = true, features = ["derive"] }
 @[for dep in dependency_packages]@
 @(dep) = "*"