Fix Python versions in nightly CI (#264)

Author: marcinz

.github/workflows/ci-gh-nightly-release.yml

@@ -25,7 +25,7 @@ jobs:
           - false
         python-version:
           - "3.10"
-          - "3.12"
+          - "3.11"
           - "3.12"
     uses:
       ./.github/workflows/gh-build-and-test.yml