Fix premake buildnin CI

Author: AdventureT

.github/workflows/ci.yaml

@@ -12,7 +12,7 @@ jobs:
         submodules: recursive
 
     - name: Premake
-      run: ./vendor/premake5/premake5.exe vs2026 --arch=x86 --renderer=DX11
+      run: .\vendor\premake\premake5.exe vs2026 --arch=x86 --renderer=DX11
 
     - name: Setup MSBuild
       uses: microsoft/setup-msbuild@v1.1