Merge pull request #18176 from github/update-eol-date-for-2.20

Update EOL date for 2.20

Author: sarahs

lib/enterprise-dates.json

@@ -81,7 +81,7 @@
   },
   "2.20": {
     "releaseDate": "2020-02-11",
-    "deprecationDate": "2021-02-11"
+    "deprecationDate": "2021-03-02"
   },
   "2.21": {
     "releaseDate": "2020-06-09",
@@ -95,4 +95,4 @@
     "releaseDate": "2021-01-12",
     "deprecationDate": "2022-01-20"
   }
-}
+}