Remove MSVC 14.0 since math no longer supports it

Author: mborland

.github/workflows/ci.yml

@@ -225,7 +225,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { toolset: msvc-14.0, cxxstd: '14,latest',      addrmd: '32,64', os: windows-2019 }
           - { toolset: msvc-14.2, cxxstd: '14,17,20',       addrmd: '32,64', os: windows-2019 }
           - { toolset: msvc-14.3, cxxstd: '14,17,20,latest',addrmd: '32,64', os: windows-2022 }
           #- { name: Collect coverage, coverage: yes,