Fix workflow

Author: Heliozoa

.github/workflows/upload-binaries.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     # due to the dynamically linked libgcc, changes here should be communicated in the changelog
     # as a change to the minimum OS version requirement
-    container: ubuntu-20.04
+    container: ubuntu:20.04
     strategy:
       fail-fast: false # we don't want to cancel building binaries for other targets just because one fails
       matrix: