Change base PR maven url

Author: jpenilla

.github/workflows/publish_pr.yml

@@ -32,5 +32,5 @@ jobs:
           publishing-token: ${{ github.token }}
           uploader-workflow-name: Build Paper
           artifacts-base-path: io/papermc/paper
-          base-maven-url: 'https://prmaven.papermc.io'
+          base-maven-url: 'https://maven-prs.papermc.io'
           self-name: 'paper-pr-publishing[bot]'