Update workflows to use .NET 10 and setup-dotnet v4

Switched actions/setup-dotnet to v4 in build-master.yml and
flowctl-release.yml. Updated .NET SDK version from 9.0.x/9.0.200
to 10.0.x to ensure builds and releases use the latest .NET.

#138

Author: ziagham

.github/workflows/build-master.yml

@@ -14,9 +14,9 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v3.2.0
+      uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 9.0.200
+        dotnet-version: 10.0.x
 
     - name: Prep packages
       run: dotnet nuget add source --username ziagham --password ${{ secrets.GH_TOKEN }} --store-password-in-clear-text --name github "https://nuget.pkg.github.com/${{github.repository_owner}}/index.json"

.github/workflows/flowctl-release.yml

@@ -52,9 +52,9 @@ jobs:
 
     #Build/pack the project
     - name: Setup .NET
-      uses: actions/setup-dotnet@v3.2.0
+      uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 9.0.x
+        dotnet-version: 10.0.x
 
     - name: Prep packages
       run: dotnet nuget add source --username ziagham --password ${{ secrets.GH_TOKEN }} --store-password-in-clear-text --name github "https://nuget.pkg.github.com/${{github.repository_owner}}/index.json"