udpate link to the spec revision history (#298)

Co-authored-by: PRADEEP BG <pradeep.b.g@intel.com>

Author: rwmcguir

scripts/templates/versions.rst.mako

@@ -4,4 +4,4 @@
  Versions
 ===================
 
-https://spec.oneapi.io/releases/index.html#level-zero
+https://oneapi-src.github.io/level-zero-spec/releases/index.html#level-zero