SoftwareSerial: Bring submodule in line with upstream release 5.2.9 (#6486)

dok-net · d-a-v · commit db460388cd7c · 2019-09-05T01:59:12.000+02:00
diff --git a/libraries/SoftwareSerial b/libraries/SoftwareSerial
@@ -1 +1 @@
-Subproject commit 4abc14f4295f3d2dd296f535c48740339edc6d4d
+Subproject commit dd9d2326f85a22ca96ef5922df044884a2f3b529
