Disable clang-18 on ununtu 24.04 (it's the same as clang), add

clang-20.

Author: sobomax

.github/workflows/rtpproxy_ci.yml

@@ -54,10 +54,12 @@ jobs:
           compiler: 'clang-16'
         - os: 24.04
           compiler: 'clang-17'
-        - os: 24.04
-          compiler: 'clang-18'
+#        - os: 24.04
+#          compiler: 'clang-18' <- this is the same as "clang" on 24.04
         - os: 24.04
           compiler: 'clang-19'
+        - os: 24.04
+          compiler: 'clang-20'
 
     steps:
     - uses: actions/checkout@v4