fix linting by using new maligned linter instead of aligncheck

upstream switched the alignment check backend and in doing so fails to run
if the old backend is defined in the config.

also skip alignment linting on a struct we use for byte decoding as we have
no choice in its member order.

linter.json

@@ -12,7 +12,7 @@
         "staticcheck",
         "varcheck",
         "structcheck",
-        "aligncheck",
+        "maligned",
         "vetshadow",
         "goconst",
         "interfacer"