[ci] Add Fedora 45

Fedora 45 will be released next week, so we should have it in the CI for
the 6.42 release branch, replacing Rawhide that we only want to exercise
on ROOT `master`.

Author: guitargeek

.github/workflows/root-ci-config/buildconfig/fedora45.txt

@@ -0,0 +1,6 @@
+CMAKE_CXX_STANDARD=23
+experimental_adaptivecpp=OFF
+pythia8=ON
+test_distrdf_pyspark=OFF
+vdt=OFF
+cefweb=ON

.github/workflows/root-ci-config/buildconfig/rawhide.txt

@@ -401,6 +401,7 @@ jobs:
         include:
           - image: fedora43
           - image: fedora44
+          - image: fedora45
           - image: alma8
           - image: alma9
             overrides: ["CMAKE_BUILD_TYPE=Debug"]
@@ -436,12 +437,6 @@ jobs:
             is_special: true
             property: "asan"
             overrides: ["ROOT_CTEST_CUSTOM_FLAGS=-E@\\(^tutorial-\\|gtest-core-metacling-TClingTest$\\|roottest-cling-specialobj-runf02$\\|roottest-root-collection-DeleteWarning$\\|roottest-root-io-evolution-fixarr2$\\|roottest-root-meta-rlibmap$\\|roottest-root-tree-cloning-runtreeCloneTest2$\\|roottest-root-treeproxy-vectorint-vectorint$\\)"]
-          # Fedora Rawhide with Python freethreading+debug build
-          - image: rawhide
-            python_venv: "/py-venv-3.15td/ROOT-CI"
-            is_special: true
-            property: "Fedora pydebug no GIL"
-            overrides: ["CMAKE_CXX_STANDARD=23"]
           # Minimal build
           - image: alma10
             platform_config: alma10-minimal