Remove Ubuntu 18.04 from the tests

Author: RobLoach

.github/workflows/Tests.yml

@@ -24,8 +24,8 @@ jobs:
         # - { name: Windows VS2022, os: windows-2022 }
         - { name: Linux GCC,      os: ubuntu-20.04, flags: -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DCMAKE_CXX_STANDARD=17 }
         - { name: Linux Clang,    os: ubuntu-20.04, flags: -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_STANDARD=17 }
-        - { name: Linux GCC,      os: ubuntu-18.04, flags: -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DCMAKE_CXX_STANDARD=14 }
-        - { name: Linux Clang,    os: ubuntu-18.04, flags: -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_STANDARD=14 }
+        #- { name: Linux GCC,      os: ubuntu-18.04, flags: -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DCMAKE_CXX_STANDARD=14 }
+        #- { name: Linux Clang,    os: ubuntu-18.04, flags: -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_STANDARD=14 }
         # - { name: MacOS XCode,    os: macos-latest }
         config:
         - { name: Shared, flags: -DBUILD_SHARED_LIBS=TRUE }