Workflows: Fix version-check.py script for when there is no RC tag yet

Reviewed By: thieta

Differential Revision: https://reviews.llvm.org/D142598

(cherry picked from commit 57b491b)

Author: tstellar

.github/workflows/version-check.py

@@ -16,7 +16,7 @@ def get_version_from_tag(tag):
 
     m = re.match('llvmorg-([0-9]+)-init', tag)
     if m:
-        return (int(m.group(1)) + 1, 0, 0)
+        return (m.group(1), "0", "0")
 
     raise Exception(f"error: Tag is not valid: {tag}")