dependency: update libxml to 2.9.10 final

related to #1937

dependencies.yml

@@ -1,11 +1,11 @@
 libxml2:
-  version: "2.9.9"
-  sha256: "94fb70890143e3c6549f265cee93ec064c80a84c42ad0f23e85ee1fd6540a871"
+  version: "2.9.10"
+  sha256: "aafee193ffb8fe0c82d4afef6ef91972cbaf5feea100edc2f262750611b4be1f"
   #  manually verified checksum:
   #
-  #    $ gpg --verify libxml2-2.9.9.tar.gz.asc ports/archives/libxml2-2.9.9.tar.gz
-  #    gpg: Signature made Thu 03 Jan 2019 01:14:47 PM EST
-  #    gpg:                using RSA key 15588B26596BEA5D
+  #    $ gpg --verify libxml2-2.9.10.tar.gz.asc ports/archives/libxml2-2.9.10.tar.gz 
+  #    gpg: Signature made Wed 30 Oct 2019 03:15:42 PM EDT
+  #    gpg:                using RSA key DB46681BB91ADCEA170FA2D415588B26596BEA5D
   #    gpg: Good signature from "Daniel Veillard (Red Hat work email) <veillard@redhat.com>" [unknown]
   #    gpg:                 aka "Daniel Veillard <Daniel.Veillard@w3.org>" [unknown]
   #    gpg: WARNING: This key is not certified with a trusted signature!
@@ -16,14 +16,15 @@ libxml2:
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   #