Fixed indentation in build.yml

.github/workflows/build.yml

@@ -3,7 +3,7 @@ name: Build
 on:
   push:
     branches-ignore:
-	  - gh-pages
+      - gh-pages
   pull_request:
     branches:
       - master
@@ -17,7 +17,7 @@ defaults:
 
 jobs:
   build:
-	runs-on: windows-latest
+    runs-on: windows-latest
     strategy:
       matrix:
         platform: ["x86", "x64"]