Update CI to use VS2026

Author: AdventureT

.github/workflows/ci.yaml

@@ -4,29 +4,23 @@ on: [push]
 
 jobs:
   win:
-    env:
-      PREMAKE_VERSION: 5.0.0-beta1
-
     runs-on: windows-latest
     steps:
     - name: Checkout
       uses: actions/checkout@master
       with:
         submodules: recursive
-    
-    - name: Setup premake
-      uses: abel0b/setup-premake@v2.3
-      with:
-        version: ${{ env.PREMAKE_VERSION }}
 
     - name: Premake
-      run: premake5 vs2022 --arch=x86 --renderer=DX11
+      run: ./vendor/premake/premake5.exe vs2026 --arch=x86 --renderer=DX11
 
     - name: Setup MSBuild
-      uses: microsoft/setup-msbuild@v1.1
+      uses: microsoft/setup-msbuild@v2
+      with:
+        vs-version: "18"
 
     - name: Build OpenToshi for release
-      run: msbuild './Toshi (DX11).sln' -property:Configuration=Release
+      run: msbuild './Toshi (DX11).slnx' -property:Configuration=Release
 
     - name: Run UnitTests
       run: .\bin\Release_Windows_x86\UnitTests\UnitTests.exe