octoprint: freeze dependencies

pkgs/applications/misc/octoprint/default.nix

@@ -16,11 +16,17 @@ let
   py = python3.override {
     self = py;
     packageOverrides = lib.foldr lib.composeExtensions (self: super: { }) ([
-      (mkOverride "flask"       "0.12.5" "fac2b9d443e49f7e7358a444a3db5950bdd0324674d92ba67f8f1f15f876b14f")
-      (mkOverride "flaskbabel"  "0.12.2" "11jwp8vvq1gnm31qh6ihy2h393hy18yn9yjp569g60r0wj1x2sii")
-      (mkOverride "tornado"     "4.5.3"  "02jzd23l4r6fswmwxaica9ldlyc2p6q8dk6dyff7j58fmdzf853d")
-      (mkOverride "psutil"      "5.6.7"  "ffad8eb2ac614518bbe3c0b8eb9dffdb3a8d2e3a7d5da51c5b974fb723a5c5aa")
-      (mkOverride "watchdog"    "0.9.0"  "07cnvvlpif7a6cg4rav39zq8fxa5pfqawchr46433pij0y6napwn")
+      (mkOverride "flask"            "0.12.5" "fac2b9d443e49f7e7358a444a3db5950bdd0324674d92ba67f8f1f15f876b14f")
+      (mkOverride "flask_assets"     "0.12"   "0ivqsihk994rxw58vdgzrx4d77d7lpzjm4qxb38hjdgvi5xm4cb0")
+      (mkOverride "flaskbabel"       "0.12.2" "11jwp8vvq1gnm31qh6ihy2h393hy18yn9yjp569g60r0wj1x2sii")
+      (mkOverride "flask_login"      "0.4.1"  "1v2j8zd558xfmgn3rfbw0xz4vizjcnk8kqw52q4f4d9ygfnc25f8")
+      (mkOverride "markdown"         "3.1.1"  "2e50876bcdd74517e7b71f3e7a76102050edec255b3983403f1a63e7c8a41e7a")
+      (mkOverride "tornado"          "4.5.3"  "02jzd23l4r6fswmwxaica9ldlyc2p6q8dk6dyff7j58fmdzf853d")
+      (mkOverride "psutil"           "5.6.7"  "ffad8eb2ac614518bbe3c0b8eb9dffdb3a8d2e3a7d5da51c5b974fb723a5c5aa")
+      (mkOverride "watchdog"         "0.9.0"  "07cnvvlpif7a6cg4rav39zq8fxa5pfqawchr46433pij0y6napwn")
+      (mkOverride "werkzeug"         "0.16.1" "010zmhyfbp4d56c1rgalwi188imjlkv9g7rm25jrvify6xnqalxk")
+      (mkOverride "websocket_client" "0.56.0" "0fpxjyr74klnyis3yf6m54askl0h5dchxcwbfjsq92xng0455m8z")
+      (mkOverride "wrapt"            "1.11.2" "1q81762dgsgrd12f8qc39zk8s5wll3m5xc32jdmlf6cls4gh4njn")
 
       # Octoprint holds back jinja2 to 2.8.1 due to breaking changes.
       # This old version does not have updated test config for pytest 4,