Bump System.Security.Cryptography.Xml

Bumps [System.Security.Cryptography.Xml](https://github.com/dotnet/runtime) from 4.7.0 to 7.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits/v7.0.0)

---
updated-dependencies:
- dependency-name: System.Security.Cryptography.Xml
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

samples/snippets/visualbasic/VS_Snippets_CLR/HowToDecryptXMLElementX509/vb/decryptxml.vbproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Security.Cryptography.Xml" Version="4.7.0" />
+    <PackageReference Include="System.Security.Cryptography.Xml" Version="7.0.0" />
   </ItemGroup>
 
 </Project>