CI: Fix broken buildspec

A stray trailing comma from a bad cherry-pick broke CI.

Reference:
https://github.com/obsproject/obs-studio/commit/3b0d71500c722916051c77c753e6003f00b92ea7

buildspec.json

@@ -31,7 +31,7 @@
                 "macos-arm64": "7c6c1c3706e08f470fb09c57bcfa49e760ba4a00dc59467e8c2c0d83bc99f0d5",
                 "ubuntu-x86_64": "cb7225c7a937ac4cdc9c41700061f45cccc640d696902357782e57f8250bf43a",
                 "ubuntu-aarch64": "e82388ef61776a88701b37d96e44f65dcc91f4d4f205f4f17cdc0d50f4e6a7a7",
-                "windows-x64": "922efbda1f2f8be9e5b2754d878a14d90afc81f04e94fc9101a7513e2b5cecc1",
+                "windows-x64": "922efbda1f2f8be9e5b2754d878a14d90afc81f04e94fc9101a7513e2b5cecc1"
             },
             "revision": {
                 "macos-x86_64": 4,