dep: update libxml to 2.12.0 and libxslt to 1.1.39

though note that libxslt was also previously updated to 1.1.39 on the
v1.15.x branch.

- https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.0
- https://gitlab.gnome.org/GNOME/libxslt/-/releases/v1.1.39

dependencies.yml

@@ -1,12 +1,12 @@
 libxml2:
-  version: "2.11.5"
-  sha256: "3727b078c360ec69fa869de14bd6f75d7ee8d36987b071e6928d4720a28df3a6"
-  # sha-256 hash provided in https://download.gnome.org/sources/libxml2/2.11/libxml2-2.11.5.sha256sum
+  version: "2.12.0"
+  sha256: "431521c8e19ca396af4fa97743b5a6bfcccddbba90e16426a15e5374cd64fe0d"
+  # sha-256 hash provided in https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.0.sha256sum
 
 libxslt:
-  version: "1.1.38"
-  sha256: "1f32450425819a09acaff2ab7a5a7f8a2ec7956e505d7beeb45e843d0e1ecab1"
-  # sha-256 hash provided in https://download.gnome.org/sources/libxslt/1.1/libxslt-1.1.38.sha256sum
+  version: "1.1.39"
+  sha256: "2a20ad621148339b0759c4d4e96719362dee64c9a096dbba625ba053846349f0"
+  # sha-256 hash provided in https://download.gnome.org/sources/libxslt/1.1/libxslt-1.1.39.sha256sum
 
 zlib:
   version: "1.3"