CI: update Maven Central env var declarations

Author: ctrueden

.github/workflows/build.yml

@@ -31,6 +31,6 @@ jobs:
           GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
           MAVEN_USER: ${{ secrets.MAVEN_USER }}
           MAVEN_PASS: ${{ secrets.MAVEN_PASS }}
-          OSSRH_USER: ${{ secrets.OSSRH_USER }}
-          OSSRH_PASS: ${{ secrets.OSSRH_PASS }}
+          CENTRAL_USER: ${{ secrets.CENTRAL_USER }}
+          CENTRAL_PASS: ${{ secrets.CENTRAL_PASS }}
           SIGNING_ASC: ${{ secrets.SIGNING_ASC }}