ci: Update deprecated GitHub Actions steps

Author: adamrodger

.github/workflows/ci.yml

@@ -19,10 +19,10 @@ jobs:
           - macos-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup .NET Core SDK
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v3
         with:
           dotnet-version: "6.0.x" # runners already have .Net Framework installed as well
 
@@ -54,10 +54,10 @@ jobs:
     if: github.ref_type == 'tag'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup .NET Core
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v3
         with:
           dotnet-version: "6.0.x" # runners already have .Net Framework installed as well