Bump actions/setup-dotnet from 1 to 1.8.0

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 1 to 1.8.0.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v1...v1.8.0)

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

.github/workflows/dotnet-build.yml

@@ -20,7 +20,7 @@ jobs:
         uses: "WyriHaximus/github-action-get-previous-tag@master"
 
       - name: Setup .NET Core
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v1.8.0
         with:
           dotnet-version: 5.0.100
 

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
           go-version: 1.15
 
       - name: Setup .NET Core
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v1.8.0
         with:
           dotnet-version: 5.0.100