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>

.github/workflows/publish-preview.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Checkout source
         uses: actions/checkout@v2
       - name: Setup .NET Core 5.0 SDK
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v2
         with:
           dotnet-version: '5.0.x'
           source-url: https://nuget.pkg.github.com/sungam3r/index.json

.github/workflows/publish-release.yml

@@ -28,7 +28,7 @@ jobs:
           echo version=$version
           echo "version=$version" >> $GITHUB_ENV
       - name: Setup .NET Core 5.0 SDK
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v2
         with:
           dotnet-version: '5.0.x'
           source-url: https://api.nuget.org/v3/index.json

.github/workflows/test.yml

@@ -32,14 +32,14 @@ jobs:
       - name: Checkout source
         uses: actions/checkout@v2
       - name: Setup .NET Core 3.1 SDK
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v2
         with:
           dotnet-version: '3.1.x'
           source-url: https://nuget.pkg.github.com/sungam3r/index.json
         env:
           NUGET_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}
       - name: Setup .NET Core 5.0 SDK
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v2
         with:
           dotnet-version: '5.0.x'
           source-url: https://nuget.pkg.github.com/sungam3r/index.json