Bump fedora from 38 to 39 (#19)

Bumps fedora from 38 to 39.

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM fedora:38
+FROM fedora:39
 
 RUN dnf -y --setopt=install_weak_deps=False install \
         borgbackup \