Bump System.Device.Gpio in /samples/led-matrix-weather (#1775)

Bumps [System.Device.Gpio](https://github.com/dotnet/iot) from 1.5.0 to 2.0.0.
- [Release notes](https://github.com/dotnet/iot/releases)
- [Commits](https://github.com/dotnet/iot/compare/1.5...2.0)

---
updated-dependencies:
- dependency-name: System.Device.Gpio
  dependency-type: direct:production
  update-type: version-update:semver-major
...
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

samples/led-matrix-weather/led-matrix-weather.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Device.Gpio" Version="1.5.0" />
+    <PackageReference Include="System.Device.Gpio" Version="2.0.0" />
     <PackageReference Include="Iot.Device.Bindings" Version="1.5.0" />
   </ItemGroup>