resources: Remove the 'v' from the version ID

Change-Id: I87aa44e51c576cf55f57ca30e7a4c3518c2b0178
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-resources/+/54443
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 2dfda2c..395ccb6 100644
--- a/resources.json
+++ b/resources.json
@@ -1,6 +1,6 @@
 
 {
-    "version" : "v21.2",
+    "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"