Cleanup: [CI] Remove 'os' input for windows workflow

.github/workflows/ci-build.yml

@@ -80,10 +80,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - os: windows-latest
-          arch: x86
-        - os: windows-latest
-          arch: x64
+        - arch: x86
+        - arch: x64
 
     name: Windows (${{ matrix.arch }})
 
@@ -91,7 +89,6 @@ jobs:
     secrets: inherit
 
     with:
-      os: ${{ matrix.os }}
       arch: ${{ matrix.arch }}
 
   check_annotations:

.github/workflows/ci-windows.yml

@@ -6,9 +6,6 @@ on:
       arch:
         required: true
         type: string
-      os:
-        required: true
-        type: string
 
 env:
   CTEST_OUTPUT_ON_FAILURE: 1
@@ -17,7 +14,7 @@ jobs:
   windows:
     name: CI
 
-    runs-on: ${{ inputs.os }}
+    runs-on: windows-latest
 
     steps:
     - name: Checkout