ci: Indent windows_arm64x to match the other jobs

The cherry-picked job came in at the 2-space indent it had as the only job on its
source branch. Bump it to 4 spaces so it sits alongside the existing jobs.

Author: BoiledElectricity

.github/workflows/build.yml

@@ -297,7 +297,7 @@ jobs:
             - run: cmake --install build --prefix build/install --config ${{matrix.config}}
             - run: ctest --parallel --output-on-failure -C ${{matrix.config}} --test-dir build/
 
-  windows_arm64x:
+    windows_arm64x:
         # Native Windows on Arm: Tests building a genuine arm64x binary and validates that an x64 test suite passes
         # windows is 2x expensive to run on GitHub machines, so only run if we know something else simple passed as well
         # needs: windows_arm