Bump Microsoft.Build.Tasks.Core from 17.12.6 to 17.12.50

---
updated-dependencies:
- dependency-name: Microsoft.Build.Tasks.Core
  dependency-version: 17.12.50
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/IgnoresAccessChecksToGenerator.Tasks/IgnoresAccessChecksToGenerator.Tasks.csproj

@@ -22,7 +22,7 @@
 
   <ItemGroup>
     <PackageReference Include="Mono.Cecil" Version="0.11.6" />
-    <PackageReference Include="Microsoft.Build.Tasks.Core" Version="17.12.6" />
+    <PackageReference Include="Microsoft.Build.Tasks.Core" Version="17.12.50" />
   </ItemGroup>
 
   <Target Name="IncludePackageDependencies">