swift

d13a8bd4 - Update update-checkout-config.json: add release/6.4.2 scheme

Update update-checkout-config.json: add release/6.4.2 scheme Copies the release/6.4.x scheme, replacing 6.4.x with 6.4.2 for repos tracked by branch, matching the pattern used for the release/6.4.0 and release/6.4.1 schemes.