Add Gateway API 1.3 (#533)

* Add gateway-api 0.8.1 and 1.0.0 versions

* Update libs/gateway-api/config.jsonnet

Co-authored-by: Jeroen Op 't Eynde <jeroen@simplistic.be>

* Add support for Gateway API 1.2.0 release

* Add gateway-api v1.3 and remove v0.7

---------

Co-authored-by: Jeroen Op 't Eynde <jeroen@simplistic.be>

Author: vtomasr5

libs/gateway-api/config.jsonnet

@@ -1,11 +1,11 @@
 local config = import 'jsonnet/config.jsonnet';
 
 local versions = [
-    {output: '0.7', version: '0.7.1'},
     {output: '0.8', version: '0.8.1'},
     {output: '1.0', version: '1.0.0'},
     {output: '1.1', version: '1.1.0'},
     {output: '1.2', version: '1.2.0'},
+    {output: '1.3', version: '1.3.0'},
 ];
 
 config.new(