Release 0.9.0

Dockerfile

@@ -1,6 +1,6 @@
 FROM debian:11-slim
 LABEL org.opencontainers.image.source=https://github.com/gbdev/rgbds
-ARG version=0.9.0-rc2
+ARG version=0.9.0
 WORKDIR /rgbds
 
 COPY . .

include/version.hpp

@@ -8,7 +8,6 @@ extern "C" {
 #define PACKAGE_VERSION_MAJOR 0
 #define PACKAGE_VERSION_MINOR 9
 #define PACKAGE_VERSION_PATCH 0
-#define PACKAGE_VERSION_RC    2
 
 char const *get_package_version_string();
 }