VS2026 support

Author: ThomasArdal

src/CronExpressionsVsix/source.extension.vsixmanifest

@@ -9,7 +9,7 @@
         <Preview>true</Preview>
     </Metadata>
     <Installation>
-        <InstallationTarget Id="Microsoft.VisualStudio.Community" Version="[17.0, 18.0)">
+        <InstallationTarget Id="Microsoft.VisualStudio.Community" Version="[17.0, 19.0)">
             <ProductArchitecture>amd64</ProductArchitecture>
         </InstallationTarget>
     </Installation>