Update maven.yml

Author: Ndacyayisenga-droid

.github/workflows/maven.yml

@@ -35,7 +35,7 @@ jobs:
         uses: hiero-ledger/hiero-solo-action@97b1a5dfff3a18ae92ffb4c27f5ada95906f66bb #v0.12.0
         with:
           installMirrorNode: true
-          hieroVersion: v0.64.2-rc1
+          hieroVersion: v0.63.7
           mirrorNodeVersion: v0.133.0
           mirrorNodePortRest: 5551
           mirrorNodePortGrpc: 5600