create-release: hardcode artifacts since we can't use the env var in build

Author: JonnyOThan

.github/workflows/create-release.yml

@@ -12,4 +12,4 @@ jobs:
     uses: KSPModdingLibs/KSPBuildTools/.github/workflows/create-release.yml@main
     with:
       version-string: ${{ inputs.version-string }}
-      artifacts: ${{ vars.BUILD_ARTIFACTS }}
+      artifacts: Resources/GameData LICENSE* README* CHANGELOG*