Correct yml indentation issue and extra keyword

Author: dempseyatgithub

.github/workflows/pull_request.yml

@@ -98,8 +98,7 @@ jobs:
       license_header_check_project_name: "Swift.org"
 
   proposal_validation:
-  name: Test
-  uses: ./.github/workflows/proposal_validation.yml
-  with:
+    name: Test
+    uses: ./.github/workflows/proposal_validation.yml
     with:
-  project: "swift"
+      project: "swift"