Clean up extra spaces (#28317)

Although these errors are not important, they affect the code specification.

tools/run_tests/sanity/check_bad_dependencies.sh

@@ -25,7 +25,7 @@ test "$(bazel query 'somepath("//test/cpp/microbenchmarks:helpers", "//external:
 
 # Make sure that core doesn't depend on anything in C++ library
 
-test "$(bazel query 'deps("//:grpc")' 2>/dev/null | grep -Ec 'src/cpp|include/grpcpp')" -eq 0 || exit 1 
+test "$(bazel query 'deps("//:grpc")' 2>/dev/null | grep -Ec 'src/cpp|include/grpcpp')" -eq 0 || exit 1
 
 exit 0