chore: update warning message (#1521)

Co-authored-by: repo-ranger[bot] <39074581+repo-ranger[bot]@users.noreply.github.com>
Co-authored-by: GitHub Action <action@github.com>

src/commitSha.ts

@@ -422,9 +422,18 @@ export const getSHAForPullRequestEvent = async (
           (await verifyCommitSha({sha: previousSha, cwd: workingDirectory})) !==
             0)
       ) {
-        core.warning(
-          'Unable to locate the remote branch head sha. Falling back to the previous commit in the local history.'
-        )
+        if (
+          github.context.payload.action &&
+          github.context.payload.action === 'synchronize'
+        ) {
+          core.warning(
+            'Unable to locate the remote branch head sha. Falling back to the previous commit in the local history.'
+          )
+        } else {
+          core.info(
+            `Unable to locate the remote branch head sha for ${github.context.eventName} (${github.context.payload.action}) events. Falling back to the previous commit in the local history.`
+          )
+        }
         previousSha = await getParentSha({
           cwd: workingDirectory
         })