Support Visual Studio 2026 (#161)

Signed-off-by: Esteve Fernandez <esteve@apache.org>

Author: esteve

colcon_cmake/task/cmake/build.py

@@ -152,6 +152,7 @@ async def _reconfigure(self, args, env):
                     'VisualStudioVersion is not set, '
                     'please run within a Visual Studio Command Prompt.')
             supported_vsv = {
+                '18.0': 'Visual Studio 18 2026',
                 '17.0': 'Visual Studio 17 2022',
                 '16.0': 'Visual Studio 16 2019',
                 '15.0': 'Visual Studio 15 2017',