ci: Enhance workflow permissions and token

Grants `pull-requests: write` permission for expanded workflow capabilities.
Switches to the built-in `github.token` for release creation, improving security and simplifying token management.

Author: MuhammadZeshan382

.github/workflows/ci-cd-pipeline.yml

@@ -8,6 +8,7 @@ on:
 permissions:
   contents: write
   packages: write
+  pull-requests: write
 
 env:
   DOCKER_IMAGE_NAME: ${{ secrets.DOCKERHUB_USERNAME }}/currencyarchiveapi
@@ -292,4 +293,4 @@ jobs:
           draft: false
           prerelease: false
         env:
-          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+          GITHUB_TOKEN: ${{ github.token }}