Roll GN to 239533d

This caused gn format to flag many things which were also fixed.

Change-Id: Ie1d9081a1b08047bec52c60f54d2a94366be1ba6
diff --git a/pw_dumb_io_baremetal_stm32f429/BUILD.gn b/pw_dumb_io_baremetal_stm32f429/BUILD.gn
index 1a3a04a..bdd2aed 100644
--- a/pw_dumb_io_baremetal_stm32f429/BUILD.gn
+++ b/pw_dumb_io_baremetal_stm32f429/BUILD.gn
@@ -18,22 +18,16 @@
 # compatible with this backend.
 if (dir_pw_dumb_io_backend == dir_pw_dumb_io_baremetal_stm32f429) {
   source_set("pw_dumb_io_baremetal_stm32f429") {
-    public_deps = [
-      "$dir_pw_boot_armv7m",
-    ]
+    public_deps = [ "$dir_pw_boot_armv7m" ]
     deps = [
       "$dir_pw_dumb_io:default_putget_bytes",
       "$dir_pw_dumb_io:facade",
       "$dir_pw_preprocessor",
     ]
-    sources = [
-      "dumb_io_baremetal.cc",
-    ]
+    sources = [ "dumb_io_baremetal.cc" ]
   }
 }
 
 pw_doc_group("docs") {
-  sources = [
-    "docs.rst",
-  ]
+  sources = [ "docs.rst" ]
 }