Bump SwiftArgumentParser checkout to 1.0.3.

Author: abertelrud

common.py

@@ -41,7 +41,7 @@
         'swift-corelibs-libdispatch': 'main',
         'swift-corelibs-foundation': 'main',
         'swift-corelibs-xctest': 'main',
-        'swift-argument-parser': '1.0.1',
+        'swift-argument-parser': '1.0.3',
         'swift-driver': 'main',
         'yams': '4.0.2',
         'swift-tools-support-core': 'main',
@@ -61,7 +61,7 @@
         'swift-corelibs-libdispatch': 'release/5.6',
         'swift-corelibs-foundation': 'release/5.6',
         'swift-corelibs-xctest': 'release/5.6',
-        'swift-argument-parser': '1.0.1',
+        'swift-argument-parser': '1.0.3',
         'swift-driver': 'release/5.6',
         'yams': '4.0.2',
         'swift-tools-support-core': 'release/5.6',