plugin/sqlite3: updated to SQLite3 Multiple Ciphers 2.2.7 (based on SQLite 3.51.2)

uppsrc/plugin/sqlite3/lib/readme-amalgamation.md

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+# Release notes
+
+# SQLite3 Multiple Ciphers amalgamation
+
+This archive contains the source code amalgamation of _SQLite3 Multiple Ciphers_.
+Additionally, the original SQLite sources are included.
+
+## Archive content
+
+File name                | Description
+:----------------------- | :----------
+sqlite3mc_amalgamation.c | C source, SQLite3 Multiple Ciphers amalgamation
+sqlite3mc_amalgamation.h | C header, SQLite3 Multiple Ciphers amalgamation
+shell3mc_amalgamation.c  | C source of the SQLite shell, SQLite3 Multiple Ciphers amalgamation
+sqlite3mc.def            | Exported Symbols for Windows DLL builds
+sqlite3.c                | C source, original SQLite amalgamation
+sqlite3.h                | C header, original SQLite amalgamation
+sqlite3ext.h             | C header for extensions, original SQLite
+shell.c                  | C source of the original SQLite shell
+
+## Support
+
+If you have any comments or problems open an issue on the _SQLite3 Multiple Ciphers_ github page:
+https://github.com/utelle/SQLite3MultipleCiphers/issues