Update the voted issues json

Author: web-flow

voted-issues-badge.json

@@ -1,6 +1,6 @@
 {
   "schemaVersion": 1,
   "label": "Voted Issues",
-  "message": "83",
+  "message": "82",
   "color": "green"
 }

voted-issues.json

@@ -408,12 +408,6 @@
       "<a href='https://github.com/SimonPeatman'>@SimonPeatman</a>",
       "Fully adopt pathlib.PurePath for file paths"
     ],
-    [
-      6,
-      "<a href='https://github.com/SciTools/iris/issues/4508'>#4508</a>",
-      "<a href='https://github.com/pp-mo'>@pp-mo</a>",
-      "Provide a neat way to get date strings from arrays with date units."
-    ],
     [
       16,
       "<a href='https://github.com/SciTools/iris/issues/4446'>#4446</a>",