chore(deps): update actions/setup-dotnet action to v5

Author: renovate[bot]

.github/workflows/master_altinn-testtools-token-generator.yml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Setup DotNet ${{ env.DOTNET_VERSION }} Environment
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@baa11fbfe1d6520db94683bd5c7a3818018e4309 # v5
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}