bump pgrx to 0.11.3 for 0.3.1 release (#53)

Author: olirice

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
         package_name:
           - pg-jsonschema
         pgrx_version:
-          - 0.11.2
+          - 0.11.3
         postgres: [14, 15, 16]
         box:
           - { runner: ubuntu-20.04, arch: amd64 }