Upgraded Actions in workflows (#72)

* Update Github Actions in nuget.yml

v3 is throwing deprecation warnings

* Update Github Actions in main.yml

Older versions of the Actions were throwing deprecation warnings.

---------

Co-authored-by: bgijzen <bgijzen@hotmail.com>

Author: hexonthebeach

.github/workflows/main.yml

@@ -11,9 +11,9 @@ jobs:
     name: Build and test
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: | 
             6.0.x

.github/workflows/nuget.yml

@@ -10,9 +10,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setup .NET
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v4
       with: 
         dotnet-version: | 
             6.0.x