AppVeyor: deactivate deploy stage

This is done via a custom script now. Uploading the same file twice results in an error.

appveyor.yml

@@ -87,15 +87,4 @@ artifacts:
   - path: deploy\win-manager\*.7z
     name: win-manager
 
-deploy:
-  - provider: BinTray
-    username: ChristianBeer
-    api_key:
-      secure: kZI9k0Kh2bFSCbXfkz+J16fGNAee1ToRMl10D8QPQsKpC2PqhF/uVMpd6gRC+OSI
-    subject: boinc
-    repo: boinc-ci
-    package: $(pkg_name)
-    version: $(pkg_version)
-    publish: true
-
 test: off