Updates TODO comment with tracking issue

Signed-off-by: Darshit Chanpura <[email protected]>

build.gradle

@@ -21,7 +21,8 @@ buildscript {
         version_tokens = opensearch_version.tokenize('-')
         opensearch_build = version_tokens[0] + '.0'
 
-        // TODO: decide whether to leave this property hardcoded or get it dynamically from core
+        // TODO: this property should be accessed dynamically once this issue is resolved:
+        // https://github.com/opensearch-project/common-utils/issues/205
         common_utils_version = '2.1.0.0';