resources: Updates resources.json version info for v21.2

Change-Id: Ibd57e63b07c499adc54736da02956a4436f2c853
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-resources/+/54403
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
diff --git a/resources.json b/resources.json
index 3aeac12..0502761 100644
--- a/resources.json
+++ b/resources.json
@@ -1,8 +1,10 @@
 
 {
-    "version" : "[DEVELOP FOR v21.2]",
-    "url_base" : "http://dist.gem5.org/dist/develop",
-    "previous-versions" : {},
+    "version" : "21.2",
+    "url_base" : "http://dist.gem5.org/dist/v21-2",
+    "previous-versions" : {
+        "develop" : "https://gem5.googlesource.com/public/gem5-resources/+/refs/heads/develop/resources.json?format=TEXT"
+    },
     "resources": [
         {
             "type": "resource",