ci: bump actions/checkout and setup-dotnet to v5

Clears the Node 20 deprecation warning on actions/checkout@v4 and aligns setup-dotnet to v5 across both workflows.

Author: phil-scott-78

.github/workflows/docs.yml

@@ -24,10 +24,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Install .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           global-json-file: global.json
 

.github/workflows/dotnet.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
       with:
         fetch-depth: 0