Cirrus CI: Adapt to Ubuntu rolling now being 25.04

Author: kinke

.cirrus.yml

@@ -12,7 +12,7 @@ clone_steps_template: &CLONE_STEPS_TEMPLATE
 common_steps_template: &COMMON_STEPS_TEMPLATE
   install_lit_script: |
     # Install lit
-    rm -f /usr/lib/python3.12/EXTERNALLY-MANAGED # required for Ubuntu 24.04
+    rm -f /usr/lib/python3.13/EXTERNALLY-MANAGED # required for Ubuntu 25.04
     python3 -m pip install --user lit
     python3 -c "import lit.main; lit.main.main();" --version . | head -n 1
   clone_submodules_script: |
@@ -197,7 +197,7 @@ task:
   environment:
     CI_ARCH: x86_64
     CI_OS: linux
-    EXTRA_APT_PACKAGES: "gdmd llvm-dev libclang-common-19-dev lld"
+    EXTRA_APT_PACKAGES: "gdmd llvm-dev libclang-common-20-dev lld"
     EXTRA_CMAKE_FLAGS: "-DBUILD_SHARED_LIBS=ON -DBUILD_LTO_LIBS=ON -DD_COMPILER=gdmd -DLDC_LINK_MANUALLY=ON"
     PARALLELISM: 8
     # for gdmd: