Only upload once to the single thirdparty repo (#1)

Tracks wpilibsuite/build-tools#77

Author: AustinShalit

.github/workflows/ci.yml

@@ -101,7 +101,6 @@ jobs:
           startsWith(github.ref, 'refs/tags/v')
         run: |
           ./gradlew publish -Pthirdparty
-          ./gradlew publish -Pthirdparty -PreleaseRepoPublish
         working-directory: combiner
         env:
           RUN_AZURE_ARTIFACTORY_RELEASE: 'TRUE'