Roll Packages from 78f684c to 6698b2d (3 revisions) (#146761)

flutter/packages@78f684c...6698b2d

2024-04-14 [email protected] Fix error in markdown parsing image dimensions (flutter#6518)
2024-04-12 [email protected] [Many] Bump to min minSdkVersion of 19 across all plugins (flutter#6506)
2024-04-12 [email protected] [video_player] Darwin implementation cleanup (flutter#6507)

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bin/internal/flutter_packages.version

@@ -1 +1 @@
-78f684ce67719fec6bb763e2ceb12e62a34a2c3e
+6698b2d67999be8c673db1905ffbb9df3047960b