Update zmusic to 1.3.0 (#422)

Author: Eonfge

gzdoom/zmusic.json

@@ -7,8 +7,8 @@
     "sources": [
         {
             "type": "archive",
-            "url": "https://github.com/zdoom/ZMusic/archive/1.2.0.tar.gz",
-            "sha256": "fc8419a5fa80faa2363a57711e4ec4670b3628aecf1dc9b4306f4add0ce09d2b",
+            "url": "https://github.com/zdoom/ZMusic/archive/1.3.0.tar.gz",
+            "sha256": "2eccd41e1cc9b38b3729ab94d65635719b2adc916de4ca9f8399ebceaee89f7f",
             "x-checker-data": {
                 "type": "anitya",
                 "project-id": 153600,