Github actions: Really disable stretch build...

Author: joto

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        name: [Ubuntu-18, Ubuntu-20, Ubuntu-22, Debian-9, Debian-10, Debian-11, Debian-Testing, Debian-Experimental, Fedora-35, Fedora-36]
+        name: [Ubuntu-18, Ubuntu-20, Ubuntu-22, Debian-10, Debian-11, Debian-Testing, Debian-Experimental, Fedora-35, Fedora-36]
         build_type: [Dev]
         cpp_compiler: [g++]
         cpp_version: [c++11]