Removed tab from yaml file.

Author: rafaelcepeda

.github/workflows/pull_request.yml

@@ -34,5 +34,5 @@ jobs:
         with:
             runner_pool: general
             build_scheme: swift-http-structured-headers-Package
-	    xcode_16_2_build_arguments_override: "-Xswiftc -Xfrontend -Xswiftc -require-explicit-sendable"
+            xcode_16_2_build_arguments_override: "-Xswiftc -Xfrontend -Xswiftc -require-explicit-sendable"
       	    xcode_16_3_build_arguments_override: "-Xswiftc -Xfrontend -Xswiftc -require-explicit-sendable"