Bump actions/setup-dotnet from 1 to 2

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 1 to 2.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v1...v2)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -31,7 +31,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup .NET 6.0
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v2
         if: matrix.framework == 'net6.0'
         with:
           dotnet-version: 6.0.x
@@ -52,7 +52,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup .NET 6.0
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v2
         with:
           dotnet-version: 6.0.x