Update README, capabilities JSON files for v1.38.0 release (#151)

Update public artifacts for v1.38.0 release

Co-authored-by: GitHub Actions <actions@github.com>

Author: styra-bot[bot]

README.md

@@ -1,4 +1,4 @@
-![OPA v1.2.0](https://img.shields.io/endpoint?url=https://openpolicyagent.org/badge-endpoint/v1.2.0) [![Regal v0.31.1](https://img.shields.io/github/v/release/styrainc/regal?filter=v0.31.1&label=Regal)](https://github.com/StyraInc/regal/releases/tag/v0.31.1)
+![OPA v1.3.0](https://img.shields.io/endpoint?url=https://openpolicyagent.org/badge-endpoint/v1.3.0) [![Regal v0.32.0](https://img.shields.io/github/v/release/styrainc/regal?filter=v0.32.0&label=Regal)](https://github.com/StyraInc/regal/releases/tag/v0.32.0)
 
 
 # Styra Enterprise OPA