ci: Add patchelf and appstream to Fedora base image

These are needed to test the CPack AppImage generator.

.gitlab/ci/docker/fedora42/deps_packages.lst

@@ -56,6 +56,8 @@ mercurial
 subversion
 
 # Packages needed to test CPack.
+appstream
+patchelf
 rpm-build
 
 # Packages needed to test find modules.

.gitlab/os-linux.yml

@@ -83,7 +83,7 @@
 ### Fedora
 
 .fedora42:
-    image: "kitware/cmake:ci-fedora42-x86_64-2025-07-22"
+    image: "kitware/cmake:ci-fedora42-x86_64-2025-09-01"
 
     variables:
         GIT_CLONE_PATH: "$CI_BUILDS_DIR/cmake ci/long file name for testing purposes"