Bump fedora from 39 to 40 in /buildenv-openjdk16

Bumps fedora from 39 to 40.

---
updated-dependencies:
- dependency-name: fedora
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

buildenv-openjdk16/Dockerfile

@@ -1,7 +1,7 @@
 
 # WARNING: generated file, use update.py for updates
 
-FROM fedora:39
+FROM fedora:40
 LABEL org.opencontainers.image.authors="horky@d3s.mff.cuni.cz"
 LABEL maintainer="horky@d3s.mff.cuni.cz"
 LABEL name=renaissance-buildenv