Update publish.yml

Author: ethan-wrasman-pkware

.github/workflows/publish.yml

@@ -43,6 +43,6 @@ jobs:
           token=$(echo -n "${{ secrets.NEXUS_USERNAME }}:${{ secrets.NEXUS_PASSWORD }}" | base64)
           curl -X POST \
             -H "Authorization: Bearer $token" \
-            -H "Content-Type: application/x-www-form-urlencoded" \
-            -d "publishing_type=automatic" \
+            -H "Content-Type: application/json" \
+            -d '{"publishing_type": "automatic"}' \
             https://ossrh-staging-api.central.sonatype.com/manual/upload/defaultRepository/com.pkware.filesystem