Fix legacy source-map compatibility issue with browserify

[eanders-ms]

After upgrading Node.js from v18 to v22, running gulp began failing with the following error:

TypeError: base64VLQ.decode is not a function
    at SourceMapConsumer._parseMappings (.../source-map-consumer.js:469:23)

This error originates from combine-source-map, a transitive dependency of browserify, which relies on an internal base64VLQ API that was only available in source-map@0.4.x.

During the Node upgrade, node_modules was reinstalled, and combine-source-map picked up a newer source-map@0.5.7, which no longer exposes base64VLQ. This caused the internal call to fail at runtime.

Solution
Added a targeted override to package.json to force combine-source-map to use source-map@0.4.4, which restores compatibility:

"overrides": {
  "combine-source-map": {
    "source-map": "0.4.4"
  }
}

This restores the build without needing to update (or swap out) browserify.