NodeJS 20.11.0 fails when building snapshot.

[ddassie-texa]

While experiment with the snapshot-blob feature of NodeJs I encountering an error during the snapshot build caused by the library:

      var file = callSite.getFileName() || "<anonymous>";
                          ^

TypeError: Cannot read properties of undefined (reading 'getFileName')

Apply the PR #48 fixes the issue, and allows me to create the blob.