fix workflow github action

Author: vinaghost

.github/workflows/pre-release.yml

@@ -38,7 +38,7 @@ jobs:
       - name: 'Create changelog'
         id: Changelog
         run: |
-          changelog="$({github.event.pull_request.body})"
+          changelog="${{github.event.pull_request.body}}"
           changelog="${changelog//'%'/'%25'}"
           changelog="${changelog//$'\n'/'%0A'}"
           changelog="${changelog//$'\r'/'%0D'}"

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
       - name: 'Create changelog'
         id: Changelog
         run: |
-          changelog="$({github.event.pull_request.body})"
+          changelog="${{github.event.pull_request.body}}"
           changelog="${changelog//'%'/'%25'}"
           changelog="${changelog//$'\n'/'%0A'}"
           changelog="${changelog//$'\r'/'%0D'}"