Update update-checkout-config.json

Update swift-driver

Author: compnerd

utils/update_checkout/update-checkout-config.json

@@ -355,7 +355,7 @@
                 "swift-tools-support-core": "0.1.8",
                 "swiftpm": "swift-DEVELOPMENT-SNAPSHOT-2020-08-18-a",
                 "swift-argument-parser": "0.3.0",
-                "swift-driver": "b590b0c8e8a26c68602af7224af1bb203f23c31a",
+                "swift-driver": "029d4baa708755c46d6bc879c6f701df6886395d",
                 "swift-syntax": "swift-DEVELOPMENT-SNAPSHOT-2020-08-18-a",
                 "swift-stress-tester": "swift-DEVELOPMENT-SNAPSHOT-2020-08-18-a",
                 "swift-corelibs-xctest": "swift-DEVELOPMENT-SNAPSHOT-2020-08-18-a",