Update README badges to reflect default branch

Author: github-actions[bot]

README.md

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 # MOSIP Reference Implementation
 
-[![Maven Package upon a push](https://github.com/mosip/mosip-ref-impl/actions/workflows/push-trigger.yml/badge.svg?branch=release-1.3.x)](https://github.com/mosip/mosip-ref-impl/actions/workflows/push-trigger.yml)
+[![Maven Package upon a push](https://github.com/mosip/mosip-ref-impl/actions/workflows/push-trigger.yml/badge.svg?branch=master)](https://github.com/mosip/mosip-ref-impl/actions/workflows/push-trigger.yml)
 
 ## Overview
 The MOSIP Reference Implementation (Ref Impl) repository contains country-specific customizations and implementations that extend the core MOSIP platform. It serves as a reference for how different countries can adapt and implement MOSIP according to their unique requirements and regulations.