MIGRATION_19_20 (issue #187) bumped the Room cache schema to version 20,
but DatabaseEncryptionTest.schemaVersionIsCarriedOntoTheEncryptedFile still
asserted the plaintext -> encrypted conversion carried version 19, so it
failed across all E2E levels after the rebase onto main.
DatabaseEncryption.migrate() carries PRAGMA user_version dynamically
(userVersion = source.version -> target.version = userVersion), and a fresh
Room open now stamps 20, so v20 genuinely survives the conversion. Update the
expected constant to 20; the assertion's intent (the version survives the
round-trip) is unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>